Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_proxy_module.xml @ 302:df728215db07
Documented "proxy_cache_lock", "proxy_cache_lock_timeout",
"fastcgi_cache_lock", and "fastcgi_cache_lock_timeout".
author | Ruslan Ermilov <ru@nginx.com> |
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date | Thu, 29 Dec 2011 15:36:38 +0000 |
parents | 94c8df379088 |
children | 86732337c730 |
rev | line source |
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1 <?xml version="1.0"?> |
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2 |
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3 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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4 |
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5 <module name="Module ngx_http_proxy_module" |
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6 link="/en/docs/http/ngx_http_proxy_module.html" |
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7 lang="en"> |
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8 |
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9 <section id="summary"> |
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10 |
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11 <para> |
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12 The <literal>ngx_http_proxy_module</literal> module allows to pass |
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13 requests to another server. |
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14 </para> |
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15 |
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16 </section> |
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17 |
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18 |
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19 <section id="example" name="Example Configuration"> |
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20 |
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21 <para> |
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22 <example> |
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23 location / { |
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24 proxy_pass http://localhost:8000; |
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25 proxy_set_header Host $host; |
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26 proxy_set_header X-Real-IP $remote_addr; |
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27 } |
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28 </example> |
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29 </para> |
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30 |
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31 </section> |
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32 |
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33 |
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34 <section id="directives" name="Directives"> |
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35 |
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36 <directive name="proxy_buffer_size"> |
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37 <syntax><value>size</value></syntax> |
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38 <default>4k|8k</default> |
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39 <context>http</context> |
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40 <context>server</context> |
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41 <context>location</context> |
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42 |
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43 <para> |
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44 Sets <value>size</value> of the buffer used for reading the first part |
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45 of a response received from the proxied server. |
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46 This part usually contains a small response header. |
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47 By default, the buffer size is equal to the size of one |
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48 buffer set by the <link id="proxy_buffers"/> directive. |
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49 It can be made smaller however. |
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50 </para> |
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51 |
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52 </directive> |
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53 |
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54 |
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55 <directive name="proxy_buffering"> |
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56 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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57 <default>on</default> |
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58 <context>http</context> |
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59 <context>server</context> |
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60 <context>location</context> |
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61 |
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62 <para> |
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63 Enables or disables buffering a response from the proxied server. |
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64 </para> |
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65 |
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66 <para> |
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67 When buffering is enabled, nginx receives a response from the proxied server |
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68 as soon as possible, saving it into buffers set by the |
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69 <link id="proxy_buffer_size"/> and <link id="proxy_buffers"/> directives. |
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70 If the whole response does not fit into memory, part of it is saved to a disk. |
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71 </para> |
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72 |
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73 <para> |
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74 When buffering is disabled, a response is passed to a client synchronously, |
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75 immediately upon receipt. |
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76 nginx will not try to read the whole response from the proxied server. |
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77 The maximum size of the data that nginx can receive from the server |
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78 at a time is set by the <link id="proxy_buffer_size"/> directive. |
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79 </para> |
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80 |
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81 </directive> |
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82 |
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83 |
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84 <directive name="proxy_buffers"> |
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85 <syntax><value>number</value> <value>size</value></syntax> |
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86 <default>8 4k|8k</default> |
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87 <context>http</context> |
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88 <context>server</context> |
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89 <context>location</context> |
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90 |
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91 <para> |
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92 Sets the <value>number</value> and <value>size</value> of |
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93 buffers used for reading a response from the proxied server, |
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94 for a single connection. |
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95 By default, the buffer size is equal to one memory page. |
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96 This is either 4K or 8K, depending on a platform. |
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97 </para> |
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98 |
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99 </directive> |
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100 |
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101 |
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102 <directive name="proxy_cache"> |
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103 <syntax><value>zone</value> | <literal>off</literal></syntax> |
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104 <default>off</default> |
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105 <context>http</context> |
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106 <context>server</context> |
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107 <context>location</context> |
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108 |
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109 <para> |
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110 Defines a zone used for caching. |
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111 The same zone can be used in several places. |
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112 The <literal>off</literal> parameter disables caching inherited |
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113 from the previous configuration level. |
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114 </para> |
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115 |
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116 </directive> |
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117 |
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118 |
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119 <directive name="proxy_cache_bypass"> |
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120 <syntax><value>string</value> ...</syntax> |
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121 <default/> |
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122 <context>http</context> |
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123 <context>server</context> |
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124 <context>location</context> |
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125 |
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126 <para> |
294 | 127 Defines conditions under which the response will not be taken from a cache. |
281
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128 If at least one value of the string parameters is not empty and is not |
294 | 129 equal to “0” then the response will not be taken from the cache: |
281
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130 <example> |
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131 proxy_cache_bypass $cookie_nocache $arg_nocache$arg_comment; |
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132 proxy_cache_bypass $http_pragma $http_authorization; |
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133 </example> |
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134 Can be used along with the <link id="proxy_no_cache"/> directive. |
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135 </para> |
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136 |
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137 </directive> |
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138 |
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139 |
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140 <directive name="proxy_cache_key"> |
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141 <syntax><value>string</value></syntax> |
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142 <default>$scheme$proxy_host$request_uri</default> |
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143 <context>http</context> |
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144 <context>server</context> |
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145 <context>location</context> |
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146 |
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147 <para> |
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148 Defines a key for caching, for example |
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149 <example> |
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150 proxy_cache_key "$host$request_uri $cookie_user"; |
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151 </example> |
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152 By default, the directive’s value is close to the string |
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153 <example> |
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154 proxy_cache_key $scheme$proxy_host$uri$is_args$args; |
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155 </example> |
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156 </para> |
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157 |
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158 </directive> |
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159 |
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160 |
302
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161 <directive name="proxy_cache_lock"> |
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162 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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163 <default>off</default> |
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164 <context>http</context> |
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165 <context>server</context> |
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166 <context>location</context> |
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167 |
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168 <para> |
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169 When enabled, only one request at a time will be allowed to populate |
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170 a new cache element identified according to the <link id="proxy_cache_key"/> |
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171 directive by passing a request to a proxied server. |
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172 Other requests of the same cache element will either wait |
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173 for a response to appear in the cache, or the cache lock for |
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174 this element to be released, up to the time set by the |
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175 <link id="proxy_cache_lock_timeout"/> directive. |
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176 </para> |
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177 |
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178 </directive> |
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179 |
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180 |
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181 <directive name="proxy_cache_lock_timeout"> |
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182 <syntax><value>time</value></syntax> |
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183 <default>5s</default> |
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184 <context>http</context> |
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185 <context>server</context> |
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186 <context>location</context> |
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187 |
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188 <para> |
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189 Sets a timeout for <link id="proxy_cache_lock"/>. |
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190 </para> |
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191 |
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192 </directive> |
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193 |
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194 |
281
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195 <directive name="proxy_cache_min_uses"> |
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196 <syntax><value>number</value></syntax> |
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197 <default>1</default> |
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198 <context>http</context> |
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199 <context>server</context> |
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200 <context>location</context> |
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201 |
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202 <para> |
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203 Sets the <value>number</value> of requests after which the response |
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204 will be cached. |
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205 </para> |
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206 |
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207 </directive> |
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208 |
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209 |
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210 <directive name="proxy_cache_path"> |
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211 <syntax> |
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212 <value>path</value> |
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213 [<literal>levels</literal>=<value>levels</value>] |
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214 <literal>keys_zone</literal>=<value>name</value>:<value>size</value> |
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215 [<literal>inactive</literal>=<value>time</value>] |
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216 [<literal>max_size</literal>=<value>size</value>]</syntax> |
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217 <default/> |
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218 <context>http</context> |
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219 |
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220 <para> |
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221 Sets path and other parameters of a cache. |
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222 Cache data are stored in files. |
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223 Both the key and file name in a cache are a result of |
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224 applying the MD5 function to the proxied URL. |
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225 |
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226 The <literal>levels</literal> parameter defines hierarchy levels of a cache. |
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227 For example, in the following configuration |
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228 <example> |
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229 proxy_cache_path /data/nginx/cache levels=1:2 keys_zone=one:10m; |
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230 </example> |
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231 file names in a cache will look like this: |
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232 <example> |
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233 /data/nginx/cache/<emphasis>c</emphasis>/<emphasis>29</emphasis>/b7f54b2df7773722d382f4809d650<emphasis>29c</emphasis> |
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234 </example> |
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235 </para> |
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236 |
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237 <para> |
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238 A cached response is first written to a temporary file, then a file is renamed. |
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239 Starting from version 0.8.9 temporary files and the cache can be put on |
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240 different file systems but be aware that in this case a file is copied |
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241 across two file systems instead of the cheap rename operation. |
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242 It is thus recommended that for any given location both cache and a directory |
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243 holding temporary files set by the <link id="proxy_temp_path"/> directive |
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244 are put on the same file system. |
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245 </para> |
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246 |
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247 <para> |
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248 In addition, all active keys and information about data are stored |
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249 in a shared memory zone, whose <value>name</value> and <value>size</value> |
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250 are configured by the <literal>keys_zone</literal> parameter. |
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251 Cached data that are not accessed during the time specified by the |
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252 <literal>inactive</literal> parameter get removed from the cache |
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253 regardless of their freshness. |
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254 By default, <literal>inactive</literal> is set to 10 minutes. |
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255 </para> |
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256 |
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257 <para> |
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258 The special process “cache manager” monitors the maximum cache size set |
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259 by the <literal>max_size</literal> parameter; |
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260 when this size is exceeded it removes the least recently used data. |
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261 </para> |
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262 |
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263 </directive> |
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264 |
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265 |
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266 <directive name="proxy_cache_use_stale"> |
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267 <syntax> |
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268 <literal>error</literal> | |
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269 <literal>timeout</literal> | |
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270 <literal>invalid_header</literal> | |
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271 <literal>updating</literal> | |
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272 <literal>http_500</literal> | |
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273 <literal>http_502</literal> | |
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274 <literal>http_503</literal> | |
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275 <literal>http_504</literal> | |
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276 <literal>http_404</literal> | |
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277 <literal>off</literal> |
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278 ...</syntax> |
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279 <default>off</default> |
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280 <context>http</context> |
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281 <context>server</context> |
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282 <context>location</context> |
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283 |
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284 <para> |
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285 If an error occurs while working with the proxied server it is possible |
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286 to use a stale cached response. |
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287 This directives determines in which cases it is permitted. |
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288 The directive’s parameters match those of the |
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289 <link id="proxy_next_upstream"/> directive. |
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290 Additionally, the <literal>updating</literal> parameter permits |
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291 to use a stale cached response if it is currently being updated. |
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292 </para> |
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293 |
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294 </directive> |
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295 |
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296 |
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297 <directive name="proxy_cache_valid"> |
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298 <syntax>[<value>code</value> ...] <value>time</value></syntax> |
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299 <default/> |
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300 <context>http</context> |
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301 <context>server</context> |
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302 <context>location</context> |
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303 |
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304 <para> |
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305 Sets caching time for different response codes. |
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306 For example, the following directives |
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307 <example> |
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308 proxy_cache_valid 200 302 10m; |
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309 proxy_cache_valid 404 1m; |
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310 </example> |
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311 set 10 minutes of caching for responses with codes 200 and 302, |
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312 and 1 minute for responses with code 404. |
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313 </para> |
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314 |
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315 <para> |
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316 If only caching <value>time</value> is specified |
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317 <example> |
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318 proxy_cache_valid 5m; |
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319 </example> |
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320 then only 200, 301, and 302 responses are cached. |
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321 </para> |
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322 |
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323 <para> |
294 | 324 In addition, it can be specified to cache any responses using the |
281
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325 <literal>any</literal> parameter: |
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326 <example> |
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327 proxy_cache_valid 200 302 10m; |
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328 proxy_cache_valid 301 1h; |
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329 proxy_cache_valid any 1m; |
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330 </example> |
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331 </para> |
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332 |
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333 </directive> |
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334 |
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335 |
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336 <directive name="proxy_connect_timeout"> |
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337 <syntax><value>time</value></syntax> |
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338 <default>60s</default> |
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339 <context>http</context> |
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340 <context>server</context> |
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341 <context>location</context> |
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342 |
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343 <para> |
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344 Defines a timeout for establishing a connection with the proxied server. |
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345 It should be noted that this timeout cannot usually exceed 75 seconds. |
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346 </para> |
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347 |
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348 </directive> |
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349 |
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350 |
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351 <directive name="proxy_hide_header"> |
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352 <syntax><value>field</value></syntax> |
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353 <default/> |
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354 <context>http</context> |
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355 <context>server</context> |
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356 <context>location</context> |
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357 |
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358 <para> |
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359 By default, |
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360 nginx does not pass the header fields <header>Date</header>, |
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361 <header>Server</header>, <header>X-Pad</header>, and |
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362 <header>X-Accel-...</header> from the response of a proxied |
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363 server to a client. |
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364 The <literal>proxy_hide_header</literal> directive sets additional fields |
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365 that will not be passed. |
294 | 366 If, on the contrary, the passing of fields needs to be permitted, |
281
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367 the <link id="proxy_pass_header"/> directive can be used. |
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368 </para> |
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369 |
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370 </directive> |
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371 |
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372 |
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373 <directive name="proxy_ignore_client_abort"> |
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374 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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375 <default>off</default> |
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376 <context>http</context> |
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377 <context>server</context> |
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378 <context>location</context> |
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379 |
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380 <para> |
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381 Determines should the connection with a proxied server be |
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382 closed if a client closes a connection without waiting |
294 | 383 for a response. |
281
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384 </para> |
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385 |
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386 </directive> |
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387 |
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388 |
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389 <directive name="proxy_ignore_headers"> |
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390 <syntax><value>field</value> ...</syntax> |
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391 <default/> |
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392 <context>http</context> |
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393 <context>server</context> |
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394 <context>location</context> |
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395 |
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396 <para> |
294 | 397 Disables processing of certain response header fields from the proxied server. |
281
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398 The following fields can be ignored: <header>X-Accel-Redirect</header>, |
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399 <header>X-Accel-Expires</header>, <header>X-Accel-Limit-Rate</header> (1.1.6), |
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400 <header>X-Accel-Buffering</header> (1.1.6), |
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401 <header>X-Accel-Charset</header> (1.1.6), <header>Expires</header>, |
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402 <header>Cache-Control</header>, and <header>Set-Cookie</header> (0.8.44). |
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403 </para> |
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404 |
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405 </directive> |
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406 |
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407 |
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408 <directive name="proxy_intercept_errors"> |
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409 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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410 <default>off</default> |
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411 <context>http</context> |
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412 <context>server</context> |
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413 <context>location</context> |
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414 |
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415 <para> |
297 | 416 Determines whether proxied responses with codes greater than or equal |
417 to 400 should be passed to a client or be redirected to nginx for processing | |
281
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418 using the <link doc="ngx_http_core_module.xml" id="error_page"/> directive. |
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419 </para> |
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420 |
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421 </directive> |
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422 |
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423 |
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424 <directive name="proxy_next_upstream"> |
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425 <syntax> |
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426 <literal>error</literal> | |
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427 <literal>timeout</literal> | |
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428 <literal>invalid_header</literal> | |
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429 <literal>http_500</literal> | |
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430 <literal>http_502</literal> | |
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431 <literal>http_503</literal> | |
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432 <literal>http_504</literal> | |
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433 <literal>http_404</literal> | |
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434 <literal>off</literal> |
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435 ...</syntax> |
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436 <default>error timeout</default> |
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437 <context>http</context> |
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438 <context>server</context> |
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439 <context>location</context> |
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440 |
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441 <para> |
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442 Specifies in which cases a request should be passed to the next server: |
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443 <list type="tag"> |
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444 |
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445 <tag-name><literal>error</literal></tag-name> |
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446 <tag-desc>an error occurred while establishing a connection with the |
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447 server, passing it a request, or reading the response header;</tag-desc> |
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448 |
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449 <tag-name><literal>timeout</literal></tag-name> |
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450 <tag-desc>a timeout has occurred while establishing a connection with the |
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451 server, passing it a request, or reading the response header;</tag-desc> |
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452 |
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453 <tag-name><literal>invalid_header</literal></tag-name> |
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454 <tag-desc>a server returned empty or invalid response;</tag-desc> |
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455 |
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456 <tag-name><literal>http_500</literal></tag-name> |
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457 <tag-desc>a server returned a response with the code 500;</tag-desc> |
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458 |
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459 <tag-name><literal>http_502</literal></tag-name> |
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460 <tag-desc>a server returned a response with the code 502;</tag-desc> |
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461 |
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462 <tag-name><literal>http_503</literal></tag-name> |
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463 <tag-desc>a server returned a response with the code 503;</tag-desc> |
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464 |
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465 <tag-name><literal>http_504</literal></tag-name> |
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466 <tag-desc>a server returned a response with the code 504;</tag-desc> |
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467 |
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468 <tag-name><literal>http_404</literal></tag-name> |
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469 <tag-desc>a server returned a response with the code 404;</tag-desc> |
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470 |
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471 <tag-name><literal>off</literal></tag-name> |
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472 <tag-desc>disables passing a request to the next server.</tag-desc> |
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473 |
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474 </list> |
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475 </para> |
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476 |
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477 <para> |
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478 It should be understood that passing a request to the next server is |
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479 only possible if a client was not sent anything yet. |
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480 That is, if an error or a timeout occurs in the middle of |
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481 transferring a response, fixing this is impossible. |
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482 </para> |
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483 |
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484 </directive> |
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485 |
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486 |
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487 <directive name="proxy_no_cache"> |
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488 <syntax><value>string</value> ...</syntax> |
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489 <default/> |
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490 <context>http</context> |
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491 <context>server</context> |
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492 <context>location</context> |
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493 |
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494 <para> |
294 | 495 Defines conditions under which the response will not be saved to a cache. |
281
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496 If at least one value of the string parameters is not empty and is not |
294 | 497 equal to “0” then the response will not be saved: |
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498 <example> |
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499 proxy_no_cache $cookie_nocache $arg_nocache$arg_comment; |
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500 proxy_no_cache $http_pragma $http_authorization; |
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501 </example> |
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502 Can be used along with the <link id="proxy_cache_bypass"/> directive. |
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503 </para> |
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504 |
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505 </directive> |
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506 |
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507 |
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508 <directive name="proxy_pass"> |
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509 <syntax><value>URL</value></syntax> |
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510 <default/> |
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511 <context>location</context> |
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512 <context>if in location</context> |
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513 <context>limit_except</context> |
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514 |
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515 <para> |
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516 Sets an address of the proxied server and a URI that maps a location. |
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517 An address can be specified as a domain name or an address, and a port, |
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518 for example, |
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519 <example> |
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520 proxy_pass http://localhost:8000/uri/; |
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521 </example> |
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522 or as a UNIX-domain socket path: |
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523 <example> |
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524 proxy_pass http://unix:/tmp/backend.socket:/uri/; |
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525 </example> |
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526 here a path is specified after the word “<literal>unix</literal>” |
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527 and enclosed in two colons. |
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528 </para> |
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529 |
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530 <para> |
294 | 531 If a domain name resolves to several addresses, all of them will be |
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532 used in a round-robin fashion. |
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533 In addition, an address can be specified as a |
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534 <link doc="ngx_http_upstream_module.xml">server group</link>. |
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535 </para> |
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536 |
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537 <para> |
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538 When passing a request to the server, part of a URI matching the location |
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539 is replaced by a URI specified in the <literal>proxy_pass</literal> directive. |
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540 This rule has two exceptions where a replacement location cannot be |
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541 defined: |
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542 <list type="bullet"> |
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543 |
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544 <listitem> |
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545 when a location is specified using a regular expression; |
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546 </listitem> |
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547 |
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548 <listitem> |
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549 if a URI is changed using the |
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550 <link doc="ngx_http_rewrite_module.xml" id="rewrite"/> directive |
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551 inside a proxied location, and this same configuration will be |
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552 used to process a request (<literal>break</literal>): |
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553 <example> |
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554 location /name/ { |
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555 rewrite /name/([^/]+) /users?name=$1 break; |
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556 proxy_pass http://127.0.0.1; |
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557 } |
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558 </example> |
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559 In these cases a URI is passed without mapping. |
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560 </listitem> |
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561 |
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562 </list> |
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563 </para> |
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564 |
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565 <para> |
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566 It can also be specified that a request URI should be passed unchanged, |
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567 in the same form it was sent by the client, not the processed form. |
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568 During a processing |
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569 <list type="bullet"> |
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570 |
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571 <listitem> |
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572 two or more adjacent slashes are replaced by one: “//” — “/”; |
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573 </listitem> |
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574 |
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575 <listitem> |
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576 links to the current directory get removed: “/./” — “/”; |
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577 </listitem> |
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578 |
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579 <listitem> |
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580 links to the parent directory get removed: “/dir/../” — “/”. |
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581 </listitem> |
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582 |
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583 </list> |
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584 </para> |
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585 |
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586 <para> |
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587 If a URI should be passed unchanged then the server URL should be specified |
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588 without a URI in the <literal>proxy_pass</literal> directive: |
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589 <example> |
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590 location /some/path/ { |
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591 proxy_pass http://127.0.0.1; |
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592 } |
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593 </example> |
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594 </para> |
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595 |
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596 <para> |
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597 Server name, its port, and passed URI can be specified using variables: |
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598 <example> |
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599 proxy_pass http://$host$uri; |
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600 </example> |
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601 or like this: |
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602 <example> |
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603 proxy_pass $request; |
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604 </example> |
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605 </para> |
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606 |
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607 <para> |
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608 In this case the server name is searched among the described |
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609 <link doc="ngx_http_upstream_module.xml">server groups</link>, |
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610 and if not found is determined using a |
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611 <link doc="ngx_http_core_module.xml" id="resolver"/>. |
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612 </para> |
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613 |
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614 </directive> |
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615 |
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616 |
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617 <directive name="proxy_pass_header"> |
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618 <syntax><value>field</value></syntax> |
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619 <default/> |
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620 <context>http</context> |
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621 <context>server</context> |
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622 <context>location</context> |
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623 |
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624 <para> |
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625 Permits to pass <link id="proxy_hide_header">otherwise disabled</link> header |
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626 fields from a proxied server to a client. |
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627 </para> |
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628 |
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629 </directive> |
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630 |
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631 |
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632 <directive name="proxy_read_timeout"> |
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633 <syntax><value>time</value></syntax> |
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634 <default>60s</default> |
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635 <context>http</context> |
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636 <context>server</context> |
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637 <context>location</context> |
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638 |
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639 <para> |
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640 Defines a timeout for reading a response from the proxied server. |
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641 A timeout is only set between two successive read operations, |
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642 not for the transmission of the whole response. |
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643 If a proxied server does not transmit anything within this time, |
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644 a connection is closed. |
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645 </para> |
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646 |
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647 </directive> |
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648 |
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649 |
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650 <directive name="proxy_redirect"> |
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651 <syntax><literal>default</literal></syntax> |
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652 <syntax><literal>off</literal></syntax> |
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653 <syntax><value>redirect</value> <value>replacement</value></syntax> |
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654 <default>default</default> |
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655 <context>http</context> |
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656 <context>server</context> |
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657 <context>location</context> |
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658 |
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659 <para> |
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660 Sets a text that should be changed in the header fields |
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661 <header>Location</header> and <header>Refresh</header> of a response |
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662 from the proxied server. |
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663 Suppose a proxied server returned the header field |
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664 “<literal>Location: http://localhost:8000/two/some/uri/</literal>”. |
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665 The directive |
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666 <example> |
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667 proxy_redirect http://localhost:8000/two/ http://frontend/one/; |
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668 </example> |
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669 will rewrite this string to |
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670 “<literal>Location: http://frontend/one/some/uri/</literal>”. |
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671 </para> |
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672 |
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673 <para> |
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674 A server name may be omitted from the <value>replacement</value> string: |
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675 <example> |
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676 proxy_redirect http://localhost:8000/two/ /; |
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677 </example> |
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678 then the primary server’s name and a port, if different from 80, |
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679 will be substituted. |
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680 </para> |
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681 |
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682 <para> |
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683 The default replacement specified by the <literal>default</literal> parameter |
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684 uses the parameters of the |
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685 <link doc="ngx_http_core_module.xml" id="location"/> and |
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686 <link id="proxy_pass"/> directives. |
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687 Hence, the two configurations below are equivalent: |
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688 <example> |
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689 location /one/ { |
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690 proxy_pass http://upstream:port/two/; |
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691 proxy_redirect default; |
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692 </example> |
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693 |
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694 <example> |
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695 location /one/ { |
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696 proxy_pass http://upstream:port/two/; |
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697 proxy_redirect http://upstream:port/two/ /one/; |
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698 </example> |
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699 The <literal>default</literal> parameter is not permitted if |
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700 <link id="proxy_pass"/> is specified using variables. |
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701 </para> |
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702 |
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703 <para> |
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704 A <value>replacement</value> string can contain variables: |
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705 <example> |
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706 proxy_redirect http://localhost:8000/ http://$host:$server_port/; |
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707 </example> |
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708 </para> |
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|
709 |
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|
710 <para> |
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711 A <value>redirect</value> can also contain (1.1.11) variables: |
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712 <example> |
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713 proxy_redirect http://$proxy_host:8000/ /; |
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714 </example> |
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715 </para> |
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716 |
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717 <para> |
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718 A directive can be specified (1.1.11) using regular expressions. |
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719 In this case, <value>replacement</value> should either start from |
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720 the “<literal>~</literal>” symbol for a case-sensitive matching, |
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721 or from the “<literal>~*</literal>” symbols for case-insensitive |
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722 matching. |
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|
723 A regular expression can contain named and positional captures, |
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724 and <value>replacement</value> can reference them: |
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725 <example> |
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726 proxy_redirect ~^(http://[^:]+):\d+(/.+)$ $1$2; |
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727 proxy_redirect ~*/user/([^/]+)/(.+)$ http://$1.example.com/$2; |
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728 </example> |
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729 </para> |
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|
730 |
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|
731 <para> |
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732 There could be several <literal>proxy_redirect</literal> directives: |
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733 <example> |
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|
734 proxy_redirect default; |
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735 proxy_redirect http://localhost:8000/ /; |
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736 proxy_redirect http://www.example.com/ /; |
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737 </example> |
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738 </para> |
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739 |
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740 <para> |
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741 The <literal>off</literal> parameter cancels all |
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742 <literal>proxy_redirect</literal> directives on the current level: |
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743 <example> |
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744 proxy_redirect off; |
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745 proxy_redirect default; |
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|
746 proxy_redirect http://localhost:8000/ /; |
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747 proxy_redirect http://www.example.com/ /; |
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748 </example> |
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749 </para> |
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|
750 |
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751 <para> |
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752 Using this directive it is also possible to add host names to relative |
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|
753 redirects issued by a proxied server: |
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754 <example> |
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755 proxy_redirect / /; |
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756 </example> |
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757 </para> |
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758 |
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759 </directive> |
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|
760 |
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|
761 |
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|
762 <directive name="proxy_send_timeout"> |
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763 <syntax><value>time</value></syntax> |
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764 <default>60s</default> |
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|
765 <context>http</context> |
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|
766 <context>server</context> |
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767 <context>location</context> |
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|
768 |
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|
769 <para> |
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770 Sets a timeout for transmitting a request to the proxied server. |
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771 A timeout is only set between two successive write operations, |
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|
772 not for the transmission of the whole request. |
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773 If a proxied server does not receive anything within this time, |
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774 a connection is closed. |
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775 </para> |
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|
776 |
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777 </directive> |
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778 |
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|
779 |
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|
780 <directive name="proxy_set_header"> |
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781 <syntax><value>field</value> <value>value</value></syntax> |
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782 <default>Host $proxy_host</default> |
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783 <default>Connection close</default> |
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784 <context>http</context> |
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785 <context>server</context> |
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786 <context>location</context> |
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787 |
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788 <para> |
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789 Allows to redefine or append fields to the request header |
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790 passed to the proxied server. |
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791 A <value>value</value> can contain text, variables, and their combination. |
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792 These directives are inherited from the previous level if and |
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793 only if there are no |
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794 <literal>proxy_set_header</literal> |
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795 directives defined on the current level. |
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796 By default, only two fields are redefined: |
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797 <example> |
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798 proxy_set_header Host $proxy_host; |
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799 proxy_set_header Connection close; |
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800 </example> |
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801 </para> |
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802 |
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803 <para> |
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804 An unchanged <header>Host</header> request header field can be passed like this: |
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805 <example> |
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806 proxy_set_header Host $http_host; |
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807 </example> |
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808 </para> |
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809 |
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810 <para> |
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811 However, if this field is not present in a client request header then |
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812 nothing will be passed. |
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813 In such a case it is better to use the <var>$host</var> variable—its |
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814 value equals the server name in the <header>Host</header> request header |
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815 field, or the primary server name if this field is not present: |
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816 <example> |
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817 proxy_set_header Host $host; |
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818 </example> |
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819 </para> |
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820 |
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|
821 <para> |
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|
822 In addition, a server name can be passed together with a port of the |
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|
823 proxied server: |
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|
824 <example> |
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825 proxy_set_header Host $host:$proxy_port; |
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|
826 </example> |
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|
827 </para> |
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|
828 |
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|
829 <para> |
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|
830 If the value of a header field is an empty string then this |
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|
831 field will not be passed to a proxied server: |
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|
832 <example> |
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|
833 proxy_set_header Accept-Encoding ""; |
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|
834 </example> |
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|
835 </para> |
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836 |
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|
837 </directive> |
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|
838 |
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|
839 |
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840 <directive name="proxy_ssl_session_reuse"> |
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841 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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842 <default>on</default> |
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843 <context>http</context> |
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844 <context>server</context> |
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845 <context>location</context> |
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846 |
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847 <para> |
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848 Determines whether SSL sessions can be reused when working with |
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849 the proxied server. |
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850 If the errors |
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851 “<literal>SSL3_GET_FINISHED:digest check failed</literal>” |
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852 appear in the logs, try to disable session reuse. |
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|
853 </para> |
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|
854 |
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|
855 </directive> |
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|
856 |
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|
857 |
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|
858 <directive name="proxy_store"> |
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859 <syntax> |
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|
860 <literal>on</literal> | |
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|
861 <literal>off</literal> | |
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|
862 <value>string</value></syntax> |
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863 <default>off</default> |
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864 <context>http</context> |
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|
865 <context>server</context> |
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|
866 <context>location</context> |
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|
867 |
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|
868 <para> |
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869 Enables saving of files to a disk. |
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870 The <literal>on</literal> parameter saves files with paths |
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|
871 corresponding to the directives |
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|
872 <link doc="ngx_http_core_module.xml" id="alias"/> or |
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|
873 <link doc="ngx_http_core_module.xml" id="root"/>. |
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|
874 The <literal>off</literal> parameter disables saving of files. |
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|
875 In addition, the file name can be set explicitly using the |
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|
876 <value>string</value> with variables: |
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|
877 <example> |
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878 proxy_store /data/www$original_uri; |
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|
879 </example> |
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|
880 </para> |
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|
881 |
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|
882 <para> |
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883 The modification time of files is set according to the received |
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|
884 <header>Last-Modified</header> response header field. |
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|
885 A response is first written to a temporary file, then a file is renamed. |
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parents:
diff
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|
886 Starting from version 0.8.9 temporary files and the persistent store |
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parents:
diff
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|
887 can be put on different file systems but be aware that in this case |
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|
888 a file is copied across two file systems instead of the cheap rename operation. |
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parents:
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|
889 It is thus recommended that for any given location both saved files and a |
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parents:
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|
890 directory holding temporary files set by the <link id="proxy_temp_path"/> |
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|
891 directive are put on the same file system. |
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|
892 </para> |
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|
893 |
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|
894 <para> |
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|
895 This directive can be used to create local copies of static unchangeable |
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|
896 files, e.g.: |
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|
897 <example> |
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|
898 location /images/ { |
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|
899 root /data/www; |
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|
900 open_file_cache_errors off; |
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|
901 error_page 404 = /fetch$uri; |
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|
902 } |
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|
903 |
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|
904 location /fetch/ { |
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|
905 internal; |
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|
906 |
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|
907 proxy_pass http://backend/; |
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|
908 proxy_store on; |
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|
909 proxy_store_access user:rw group:rw all:r; |
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|
910 proxy_temp_path /data/temp; |
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|
911 |
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|
912 alias /data/www/; |
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913 } |
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|
914 </example> |
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915 </para> |
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|
916 |
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|
917 <para> |
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|
918 or like this: |
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919 <example> |
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920 location /images/ { |
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|
921 root /data/www; |
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|
922 error_page 404 = @fetch; |
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923 } |
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924 |
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|
925 location @fetch { |
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926 internal; |
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927 |
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|
928 proxy_pass http://backend; |
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929 proxy_store on; |
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930 proxy_store_access user:rw group:rw all:r; |
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931 proxy_temp_path /data/temp; |
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932 |
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|
933 root /data/www; |
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934 } |
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935 </example> |
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936 </para> |
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937 |
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938 </directive> |
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939 |
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940 |
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941 <directive name="proxy_store_access"> |
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942 <syntax><value>users</value>:<value>permissions</value> ...</syntax> |
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943 <default>user:rw</default> |
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944 <context>http</context> |
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945 <context>server</context> |
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946 <context>location</context> |
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947 |
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948 <para> |
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949 Sets access permissions for newly created files and directories, e.g.: |
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950 <example> |
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951 proxy_store_access user:rw group:rw all:r; |
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952 </example> |
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953 </para> |
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954 |
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955 <para> |
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956 If any <literal>group</literal> or <literal>all</literal> access permissions |
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957 are specified then <literal>user</literal> permissions may be omitted: |
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958 <example> |
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959 proxy_store_access group:rw all:r; |
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960 </example> |
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961 </para> |
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962 |
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963 </directive> |
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964 |
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965 |
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966 <directive name="proxy_temp_path"> |
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967 <syntax> |
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968 <value>path</value> |
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969 [<value>level1</value> |
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970 [<value>level2</value> |
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971 [<value>level3</value>]]]</syntax> |
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972 <default>proxy_temp</default> |
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973 <context>http</context> |
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974 <context>server</context> |
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975 <context>location</context> |
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976 |
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977 <para> |
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978 Defines a directory for storing temporary files |
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979 received from another server. |
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980 Up to three-level subdirectory hierarchy can be used underneath the specified |
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981 directory. |
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982 For example, in the following configuration |
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983 <example> |
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984 proxy_temp_path /spool/nginx/proxy_temp 1 2; |
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985 </example> |
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986 a temporary file might look like this: |
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987 <example> |
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988 /spool/nginx/proxy_temp/<emphasis>7</emphasis>/<emphasis>45</emphasis>/00000123<emphasis>457</emphasis> |
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989 </example> |
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990 </para> |
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991 |
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992 </directive> |
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993 |
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994 </section> |
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995 |
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996 |
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997 <section id="variables" name="Embedded Variables"> |
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998 |
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999 <para> |
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1000 The <literal>ngx_http_proxy_module</literal> module supports embedded variables |
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1001 that can be used to compose headers using the |
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1002 <link id="proxy_set_header"/> directive: |
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1003 <list type="tag"> |
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1004 |
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1005 <tag-name><var>$proxy_host</var></tag-name> |
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1006 <tag-desc>name and port of a proxied server;</tag-desc> |
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1007 |
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1008 <tag-name><var>$proxy_port</var></tag-name> |
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1009 <tag-desc>port of a proxied server;</tag-desc> |
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1010 |
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1011 <tag-name><var>$proxy_add_x_forwarded_for</var></tag-name> |
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1012 <tag-desc>the <header>X-Forwarded-For</header> client request header field |
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1013 with the <var>$remote_addr</var> variable appended to it, separated by a comma. |
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1014 If the <header>X-Forwarded-For</header> field is not present in the client |
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1015 request header, the <var>$proxy_add_x_forwarded_for</var> variable is equal |
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1016 to the <var>$remote_addr</var> variable.</tag-desc> |
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1017 </list> |
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1018 </para> |
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1019 |
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1020 </section> |
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1021 |
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1022 </module> |