Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_proxy_module.xml @ 281:7142ddd2764c
Translated current version of ngx_http_proxy_module documentation into English.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 27 Dec 2011 11:35:46 +0000 |
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children | 9f5ee1c6fca5 |
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Translated current version of ngx_http_proxy_module documentation into English.
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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> |
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127 Defines conditions under which the answer will not be taken from a cache. |
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128 If at least one value of the string parameters is not empty and is not |
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129 equal to “0” then the answer will not be taken from the cache: |
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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 |
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161 <directive name="proxy_cache_min_uses"> |
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162 <syntax><value>number</value></syntax> |
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163 <default>1</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 Sets the <value>number</value> of requests after which the response |
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170 will be cached. |
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171 </para> |
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172 |
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173 </directive> |
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174 |
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175 |
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176 <directive name="proxy_cache_path"> |
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177 <syntax> |
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178 <value>path</value> |
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179 [<literal>levels</literal>=<value>levels</value>] |
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180 <literal>keys_zone</literal>=<value>name</value>:<value>size</value> |
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181 [<literal>inactive</literal>=<value>time</value>] |
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182 [<literal>max_size</literal>=<value>size</value>]</syntax> |
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183 <default/> |
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184 <context>http</context> |
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185 |
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186 <para> |
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187 Sets path and other parameters of a cache. |
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188 Cache data are stored in files. |
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189 Both the key and file name in a cache are a result of |
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190 applying the MD5 function to the proxied URL. |
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191 |
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192 The <literal>levels</literal> parameter defines hierarchy levels of a cache. |
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193 For example, in the following configuration |
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194 <example> |
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195 proxy_cache_path /data/nginx/cache levels=1:2 keys_zone=one:10m; |
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196 </example> |
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197 file names in a cache will look like this: |
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198 <example> |
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199 /data/nginx/cache/<emphasis>c</emphasis>/<emphasis>29</emphasis>/b7f54b2df7773722d382f4809d650<emphasis>29c</emphasis> |
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200 </example> |
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201 </para> |
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202 |
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203 <para> |
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204 A cached response is first written to a temporary file, then a file is renamed. |
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205 Starting from version 0.8.9 temporary files and the cache can be put on |
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206 different file systems but be aware that in this case a file is copied |
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207 across two file systems instead of the cheap rename operation. |
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208 It is thus recommended that for any given location both cache and a directory |
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209 holding temporary files set by the <link id="proxy_temp_path"/> directive |
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210 are put on the same file system. |
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211 </para> |
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212 |
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213 <para> |
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214 In addition, all active keys and information about data are stored |
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215 in a shared memory zone, whose <value>name</value> and <value>size</value> |
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216 are configured by the <literal>keys_zone</literal> parameter. |
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217 Cached data that are not accessed during the time specified by the |
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218 <literal>inactive</literal> parameter get removed from the cache |
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219 regardless of their freshness. |
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220 By default, <literal>inactive</literal> is set to 10 minutes. |
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221 </para> |
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222 |
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223 <para> |
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224 The special process “cache manager” monitors the maximum cache size set |
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225 by the <literal>max_size</literal> parameter; |
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226 when this size is exceeded it removes the least recently used data. |
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227 </para> |
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228 |
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229 </directive> |
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230 |
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231 |
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232 <directive name="proxy_cache_use_stale"> |
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233 <syntax> |
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234 <literal>error</literal> | |
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235 <literal>timeout</literal> | |
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236 <literal>invalid_header</literal> | |
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237 <literal>updating</literal> | |
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238 <literal>http_500</literal> | |
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239 <literal>http_502</literal> | |
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240 <literal>http_503</literal> | |
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241 <literal>http_504</literal> | |
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242 <literal>http_404</literal> | |
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243 <literal>off</literal> |
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244 ...</syntax> |
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245 <default>off</default> |
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246 <context>http</context> |
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247 <context>server</context> |
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248 <context>location</context> |
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249 |
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250 <para> |
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251 If an error occurs while working with the proxied server it is possible |
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252 to use a stale cached response. |
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253 This directives determines in which cases it is permitted. |
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254 The directive’s parameters match those of the |
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255 <link id="proxy_next_upstream"/> directive. |
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256 Additionally, the <literal>updating</literal> parameter permits |
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257 to use a stale cached response if it is currently being updated. |
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258 </para> |
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259 |
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260 </directive> |
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261 |
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262 |
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263 <directive name="proxy_cache_valid"> |
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264 <syntax>[<value>code</value> ...] <value>time</value></syntax> |
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265 <default/> |
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266 <context>http</context> |
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267 <context>server</context> |
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268 <context>location</context> |
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269 |
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270 <para> |
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271 Sets caching time for different response codes. |
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272 For example, the following directives |
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273 <example> |
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274 proxy_cache_valid 200 302 10m; |
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275 proxy_cache_valid 404 1m; |
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276 </example> |
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277 set 10 minutes of caching for responses with codes 200 and 302, |
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278 and 1 minute for responses with code 404. |
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279 </para> |
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280 |
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281 <para> |
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282 If only caching <value>time</value> is specified |
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283 <example> |
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284 proxy_cache_valid 5m; |
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285 </example> |
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286 then only 200, 301, and 302 responses are cached. |
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287 </para> |
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288 |
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289 <para> |
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290 In addition, it can be specified to cache any answers using the |
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291 <literal>any</literal> parameter: |
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292 <example> |
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293 proxy_cache_valid 200 302 10m; |
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294 proxy_cache_valid 301 1h; |
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295 proxy_cache_valid any 1m; |
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296 </example> |
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297 </para> |
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298 |
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299 </directive> |
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300 |
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301 |
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302 <directive name="proxy_connect_timeout"> |
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303 <syntax><value>time</value></syntax> |
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304 <default>60s</default> |
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305 <context>http</context> |
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306 <context>server</context> |
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307 <context>location</context> |
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308 |
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309 <para> |
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310 Defines a timeout for establishing a connection with the proxied server. |
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311 It should be noted that this timeout cannot usually exceed 75 seconds. |
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312 </para> |
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313 |
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314 </directive> |
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315 |
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316 |
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317 <directive name="proxy_hide_header"> |
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318 <syntax><value>field</value></syntax> |
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319 <default/> |
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320 <context>http</context> |
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321 <context>server</context> |
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322 <context>location</context> |
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323 |
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324 <para> |
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325 By default, |
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326 nginx does not pass the header fields <header>Date</header>, |
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327 <header>Server</header>, <header>X-Pad</header>, and |
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328 <header>X-Accel-...</header> from the response of a proxied |
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329 server to a client. |
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330 The <literal>proxy_hide_header</literal> directive sets additional fields |
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331 that will not be passed. |
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332 If, on the contrary, the passing of fields needs to be enabled, |
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333 the <link id="proxy_pass_header"/> directive can be used. |
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334 </para> |
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335 |
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336 </directive> |
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337 |
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338 |
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339 <directive name="proxy_ignore_client_abort"> |
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340 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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341 <default>off</default> |
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342 <context>http</context> |
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343 <context>server</context> |
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344 <context>location</context> |
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345 |
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346 <para> |
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347 Determines should the connection with a proxied server be |
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348 closed if a client closes a connection without waiting |
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349 for an answer. |
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350 </para> |
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351 |
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352 </directive> |
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353 |
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354 |
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355 <directive name="proxy_ignore_headers"> |
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356 <syntax><value>field</value> ...</syntax> |
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357 <default/> |
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358 <context>http</context> |
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359 <context>server</context> |
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360 <context>location</context> |
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361 |
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362 <para> |
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363 Disables processing of some response header fields from the proxied server. |
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364 The following fields can be ignored: <header>X-Accel-Redirect</header>, |
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365 <header>X-Accel-Expires</header>, <header>X-Accel-Limit-Rate</header> (1.1.6), |
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366 <header>X-Accel-Buffering</header> (1.1.6), |
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367 <header>X-Accel-Charset</header> (1.1.6), <header>Expires</header>, |
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368 <header>Cache-Control</header>, and <header>Set-Cookie</header> (0.8.44). |
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369 </para> |
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370 |
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371 </directive> |
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372 |
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373 |
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374 <directive name="proxy_intercept_errors"> |
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375 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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376 <default>off</default> |
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377 <context>http</context> |
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378 <context>server</context> |
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379 <context>location</context> |
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380 |
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381 <para> |
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382 Determines whether proxied responses with codes greater or equal to 400 |
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383 should be passed to a client or be redirected to nginx for processing |
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384 using the <link doc="ngx_http_core_module.xml" id="error_page"/> directive. |
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385 </para> |
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386 |
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387 </directive> |
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388 |
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389 |
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390 <directive name="proxy_next_upstream"> |
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391 <syntax> |
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392 <literal>error</literal> | |
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393 <literal>timeout</literal> | |
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394 <literal>invalid_header</literal> | |
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395 <literal>http_500</literal> | |
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396 <literal>http_502</literal> | |
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397 <literal>http_503</literal> | |
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398 <literal>http_504</literal> | |
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399 <literal>http_404</literal> | |
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400 <literal>off</literal> |
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401 ...</syntax> |
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402 <default>error timeout</default> |
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403 <context>http</context> |
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404 <context>server</context> |
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405 <context>location</context> |
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406 |
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407 <para> |
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408 Specifies in which cases a request should be passed to the next server: |
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409 <list type="tag"> |
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410 |
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411 <tag-name><literal>error</literal></tag-name> |
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412 <tag-desc>an error occurred while establishing a connection with the |
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413 server, passing it a request, or reading the response header;</tag-desc> |
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414 |
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415 <tag-name><literal>timeout</literal></tag-name> |
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416 <tag-desc>a timeout has occurred while establishing a connection with the |
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417 server, passing it a request, or reading the response header;</tag-desc> |
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418 |
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419 <tag-name><literal>invalid_header</literal></tag-name> |
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420 <tag-desc>a server returned empty or invalid response;</tag-desc> |
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421 |
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422 <tag-name><literal>http_500</literal></tag-name> |
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423 <tag-desc>a server returned a response with the code 500;</tag-desc> |
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424 |
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425 <tag-name><literal>http_502</literal></tag-name> |
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426 <tag-desc>a server returned a response with the code 502;</tag-desc> |
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427 |
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428 <tag-name><literal>http_503</literal></tag-name> |
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429 <tag-desc>a server returned a response with the code 503;</tag-desc> |
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430 |
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431 <tag-name><literal>http_504</literal></tag-name> |
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432 <tag-desc>a server returned a response with the code 504;</tag-desc> |
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433 |
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434 <tag-name><literal>http_404</literal></tag-name> |
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435 <tag-desc>a server returned a response with the code 404;</tag-desc> |
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436 |
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437 <tag-name><literal>off</literal></tag-name> |
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438 <tag-desc>disables passing a request to the next server.</tag-desc> |
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439 |
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440 </list> |
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441 </para> |
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442 |
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443 <para> |
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444 It should be understood that passing a request to the next server is |
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445 only possible if a client was not sent anything yet. |
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446 That is, if an error or a timeout occurs in the middle of |
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447 transferring a response, fixing this is impossible. |
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448 </para> |
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449 |
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450 </directive> |
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451 |
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452 |
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453 <directive name="proxy_no_cache"> |
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454 <syntax><value>string</value> ...</syntax> |
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455 <default/> |
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456 <context>http</context> |
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457 <context>server</context> |
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458 <context>location</context> |
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459 |
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460 <para> |
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461 Defines conditions under which the answer will not be saved to a cache. |
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462 If at least one value of the string parameters is not empty and is not |
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463 equal to “0” then the answer will not be saved: |
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464 <example> |
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465 proxy_no_cache $cookie_nocache $arg_nocache$arg_comment; |
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466 proxy_no_cache $http_pragma $http_authorization; |
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467 </example> |
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468 Can be used along with the <link id="proxy_cache_bypass"/> directive. |
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469 </para> |
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470 |
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471 </directive> |
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472 |
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473 |
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474 <directive name="proxy_pass"> |
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475 <syntax><value>URL</value></syntax> |
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476 <default/> |
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477 <context>location</context> |
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478 <context>if in location</context> |
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479 <context>limit_except</context> |
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480 |
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481 <para> |
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482 Sets an address of the proxied server and a URI that maps a location. |
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483 An address can be specified as a domain name or an address, and a port, |
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484 for example, |
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485 <example> |
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486 proxy_pass http://localhost:8000/uri/; |
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487 </example> |
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488 or as a UNIX-domain socket path: |
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489 <example> |
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490 proxy_pass http://unix:/tmp/backend.socket:/uri/; |
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491 </example> |
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492 here a path is specified after the word “<literal>unix</literal>” |
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493 and enclosed in two colons. |
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494 </para> |
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495 |
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496 <para> |
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497 If a domain name maps to several addresses, all of them will be |
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498 used in a round-robin fashion. |
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499 In addition, an address can be specified as a |
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500 <link doc="ngx_http_upstream_module.xml">server group</link>. |
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501 </para> |
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502 |
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503 <para> |
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504 When passing a request to the server, part of a URI matching the location |
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505 is replaced by a URI specified in the <literal>proxy_pass</literal> directive. |
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506 This rule has two exceptions where a replacement location cannot be |
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507 defined: |
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508 <list type="bullet"> |
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509 |
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510 <listitem> |
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511 when a location is specified using a regular expression; |
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512 </listitem> |
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513 |
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514 <listitem> |
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515 if a URI is changed using the |
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516 <link doc="ngx_http_rewrite_module.xml" id="rewrite"/> directive |
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517 inside a proxied location, and this same configuration will be |
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518 used to process a request (<literal>break</literal>): |
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519 <example> |
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520 location /name/ { |
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521 rewrite /name/([^/]+) /users?name=$1 break; |
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522 proxy_pass http://127.0.0.1; |
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523 } |
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524 </example> |
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525 In these cases a URI is passed without mapping. |
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526 </listitem> |
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527 |
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528 </list> |
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529 </para> |
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530 |
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531 <para> |
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532 It can also be specified that a request URI should be passed unchanged, |
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533 in the same form it was sent by the client, not the processed form. |
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534 During a processing |
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535 <list type="bullet"> |
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536 |
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537 <listitem> |
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538 two or more adjacent slashes are replaced by one: “//” — “/”; |
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539 </listitem> |
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540 |
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541 <listitem> |
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542 links to the current directory get removed: “/./” — “/”; |
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543 </listitem> |
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544 |
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545 <listitem> |
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546 links to the parent directory get removed: “/dir/../” — “/”. |
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547 </listitem> |
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548 |
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549 </list> |
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550 </para> |
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551 |
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552 <para> |
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553 If a URI should be passed unchanged then the server URL should be specified |
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554 without a URI in the <literal>proxy_pass</literal> directive: |
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555 <example> |
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556 location /some/path/ { |
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557 proxy_pass http://127.0.0.1; |
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558 } |
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559 </example> |
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560 </para> |
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561 |
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562 <para> |
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563 Server name, its port, and passed URI can be specified using variables: |
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564 <example> |
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565 proxy_pass http://$host$uri; |
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566 </example> |
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567 or like this: |
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568 <example> |
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569 proxy_pass $request; |
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570 </example> |
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571 </para> |
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572 |
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573 <para> |
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574 In this case the server name is searched among the described |
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575 <link doc="ngx_http_upstream_module.xml">server groups</link>, |
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576 and if not found is determined using a |
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577 <link doc="ngx_http_core_module.xml" id="resolver"/>. |
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578 </para> |
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579 |
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580 </directive> |
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581 |
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582 |
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583 <directive name="proxy_pass_header"> |
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584 <syntax><value>field</value></syntax> |
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585 <default/> |
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586 <context>http</context> |
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587 <context>server</context> |
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588 <context>location</context> |
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589 |
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590 <para> |
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591 Permits to pass <link id="proxy_hide_header">otherwise disabled</link> header |
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592 fields from a proxied server to a client. |
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593 </para> |
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594 |
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595 </directive> |
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596 |
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597 |
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598 <directive name="proxy_read_timeout"> |
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599 <syntax><value>time</value></syntax> |
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600 <default>60s</default> |
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601 <context>http</context> |
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602 <context>server</context> |
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603 <context>location</context> |
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604 |
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605 <para> |
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606 Defines a timeout for reading a response from the proxied server. |
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607 A timeout is only set between two successive read operations, |
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608 not for the transmission of the whole response. |
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609 If a proxied server does not transmit anything within this time, |
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610 a connection is closed. |
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611 </para> |
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612 |
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613 </directive> |
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614 |
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615 |
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616 <directive name="proxy_redirect"> |
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617 <syntax><literal>default</literal></syntax> |
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618 <syntax><literal>off</literal></syntax> |
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619 <syntax><value>redirect</value> <value>replacement</value></syntax> |
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620 <default>default</default> |
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621 <context>http</context> |
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622 <context>server</context> |
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623 <context>location</context> |
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624 |
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625 <para> |
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626 Sets a text that should be changed in the header fields |
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627 <header>Location</header> and <header>Refresh</header> of a response |
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628 from the proxied server. |
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629 Suppose a proxied server returned the header field |
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630 “<literal>Location: http://localhost:8000/two/some/uri/</literal>”. |
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631 The directive |
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632 <example> |
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633 proxy_redirect http://localhost:8000/two/ http://frontend/one/; |
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634 </example> |
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635 will rewrite this string to |
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636 “<literal>Location: http://frontend/one/some/uri/</literal>”. |
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637 </para> |
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638 |
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639 <para> |
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640 A server name may be omitted from the <value>replacement</value> string: |
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641 <example> |
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642 proxy_redirect http://localhost:8000/two/ /; |
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643 </example> |
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644 then the primary server’s name and a port, if different from 80, |
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645 will be substituted. |
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646 </para> |
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647 |
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648 <para> |
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649 The default replacement specified by the <literal>default</literal> parameter |
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650 uses the parameters of the |
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651 <link doc="ngx_http_core_module.xml" id="location"/> and |
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652 <link id="proxy_pass"/> directives. |
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653 Hence, the two configurations below are equivalent: |
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654 <example> |
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655 location /one/ { |
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656 proxy_pass http://upstream:port/two/; |
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657 proxy_redirect default; |
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658 </example> |
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659 |
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660 <example> |
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661 location /one/ { |
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662 proxy_pass http://upstream:port/two/; |
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663 proxy_redirect http://upstream:port/two/ /one/; |
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664 </example> |
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665 The <literal>default</literal> parameter is not permitted if |
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666 <link id="proxy_pass"/> is specified using variables. |
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667 </para> |
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668 |
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669 <para> |
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670 A <value>replacement</value> string can contain variables: |
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671 <example> |
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672 proxy_redirect http://localhost:8000/ http://$host:$server_port/; |
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673 </example> |
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674 </para> |
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675 |
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676 <para> |
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677 A <value>redirect</value> can also contain (1.1.11) variables: |
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678 <example> |
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679 proxy_redirect http://$proxy_host:8000/ /; |
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680 </example> |
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681 </para> |
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682 |
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683 <para> |
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684 A directive can be specified (1.1.11) using regular expressions. |
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685 In this case, <value>replacement</value> should either start from |
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686 the “<literal>~</literal>” symbol for a case-sensitive matching, |
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687 or from the “<literal>~*</literal>” symbols for case-insensitive |
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688 matching. |
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689 A regular expression can contain named and positional captures, |
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690 and <value>replacement</value> can reference them: |
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691 <example> |
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692 proxy_redirect ~^(http://[^:]+):\d+(/.+)$ $1$2; |
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693 proxy_redirect ~*/user/([^/]+)/(.+)$ http://$1.example.com/$2; |
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694 </example> |
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695 </para> |
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696 |
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697 <para> |
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698 There could be several <literal>proxy_redirect</literal> directives: |
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699 <example> |
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700 proxy_redirect default; |
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701 proxy_redirect http://localhost:8000/ /; |
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702 proxy_redirect http://www.example.com/ /; |
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703 </example> |
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704 </para> |
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705 |
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706 <para> |
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|
707 The <literal>off</literal> parameter cancels all |
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708 <literal>proxy_redirect</literal> directives on the current level: |
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709 <example> |
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710 proxy_redirect off; |
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711 proxy_redirect default; |
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712 proxy_redirect http://localhost:8000/ /; |
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713 proxy_redirect http://www.example.com/ /; |
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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 Using this directive it is also possible to add host names to relative |
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719 redirects issued by a proxied server: |
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720 <example> |
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721 proxy_redirect / /; |
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722 </example> |
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723 </para> |
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724 |
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725 </directive> |
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|
726 |
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|
727 |
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|
728 <directive name="proxy_send_timeout"> |
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729 <syntax><value>time</value></syntax> |
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730 <default>60s</default> |
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731 <context>http</context> |
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732 <context>server</context> |
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733 <context>location</context> |
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734 |
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|
735 <para> |
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736 Sets a timeout for transmitting a request to the proxied server. |
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737 A timeout is only set between two successive write operations, |
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738 not for the transmission of the whole request. |
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739 If a proxied server does not receive anything within this time, |
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740 a connection is closed. |
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741 </para> |
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742 |
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743 </directive> |
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744 |
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|
745 |
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746 <directive name="proxy_set_header"> |
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747 <syntax><value>field</value> <value>value</value></syntax> |
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748 <default>Host $proxy_host</default> |
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749 <default>Connection close</default> |
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750 <context>http</context> |
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|
751 <context>server</context> |
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752 <context>location</context> |
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|
753 |
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|
754 <para> |
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755 Allows to redefine or append fields to the request header |
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|
756 passed to the proxied server. |
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|
757 A <value>value</value> can contain text, variables, and their combination. |
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|
758 These directives are inherited from the previous level if and |
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|
759 only if there are no |
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|
760 <literal>proxy_set_header</literal> |
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|
761 directives defined on the current level. |
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|
762 By default, only two fields are redefined: |
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763 <example> |
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|
764 proxy_set_header Host $proxy_host; |
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|
765 proxy_set_header Connection close; |
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|
766 </example> |
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|
767 </para> |
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|
768 |
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|
769 <para> |
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|
770 An unchanged <header>Host</header> request header field can be passed like this: |
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771 <example> |
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772 proxy_set_header Host $http_host; |
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773 </example> |
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774 </para> |
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|
775 |
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|
776 <para> |
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777 However, if this field is not present in a client request header then |
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778 nothing will be passed. |
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779 In such a case it is better to use the <var>$host</var> variable—its |
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|
780 value equals the server name in the <header>Host</header> request header |
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|
781 field, or the primary server name if this field is not present: |
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782 <example> |
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783 proxy_set_header Host $host; |
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784 </example> |
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785 </para> |
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|
786 |
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787 <para> |
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788 In addition, a server name can be passed together with a port of the |
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789 proxied server: |
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790 <example> |
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791 proxy_set_header Host $host:$proxy_port; |
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792 </example> |
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793 </para> |
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794 |
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795 <para> |
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796 If the value of a header field is an empty string then this |
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|
797 field will not be passed to a proxied server: |
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798 <example> |
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799 proxy_set_header Accept-Encoding ""; |
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800 </example> |
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801 </para> |
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802 |
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803 </directive> |
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804 |
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|
805 |
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|
806 <directive name="proxy_ssl_session_reuse"> |
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807 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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808 <default>on</default> |
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809 <context>http</context> |
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810 <context>server</context> |
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811 <context>location</context> |
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812 |
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|
813 <para> |
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parents:
diff
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|
814 Determines whether SSL sessions can be reused when working with |
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parents:
diff
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|
815 the proxied server. |
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parents:
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|
816 If the errors |
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|
817 “<literal>SSL3_GET_FINISHED:digest check failed</literal>” |
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818 appear in the logs, try to disable session reuse. |
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|
819 </para> |
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|
820 |
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|
821 </directive> |
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|
822 |
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|
823 |
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|
824 <directive name="proxy_store"> |
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825 <syntax> |
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826 <literal>on</literal> | |
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827 <literal>off</literal> | |
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828 <value>string</value></syntax> |
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829 <default>off</default> |
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830 <context>http</context> |
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831 <context>server</context> |
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832 <context>location</context> |
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|
833 |
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|
834 <para> |
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835 Enables saving of files to a disk. |
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836 The <literal>on</literal> parameter saves files with paths |
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837 corresponding to the directives |
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838 <link doc="ngx_http_core_module.xml" id="alias"/> or |
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839 <link doc="ngx_http_core_module.xml" id="root"/>. |
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840 The <literal>off</literal> parameter disables saving of files. |
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841 In addition, the file name can be set explicitly using the |
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842 <value>string</value> with variables: |
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843 <example> |
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844 proxy_store /data/www$original_uri; |
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845 </example> |
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846 </para> |
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847 |
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|
848 <para> |
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849 The modification time of files is set according to the received |
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850 <header>Last-Modified</header> response header field. |
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851 A response is first written to a temporary file, then a file is renamed. |
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852 Starting from version 0.8.9 temporary files and the persistent store |
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853 can be put on different file systems but be aware that in this case |
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|
854 a file is copied across two file systems instead of the cheap rename operation. |
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855 It is thus recommended that for any given location both saved files and a |
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|
856 directory holding temporary files set by the <link id="proxy_temp_path"/> |
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857 directive are put on the same file system. |
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858 </para> |
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|
859 |
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860 <para> |
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861 This directive can be used to create local copies of static unchangeable |
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862 files, e.g.: |
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863 <example> |
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864 location /images/ { |
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865 root /data/www; |
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866 open_file_cache_errors off; |
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867 error_page 404 = /fetch$uri; |
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868 } |
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|
869 |
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|
870 location /fetch/ { |
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871 internal; |
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|
872 |
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|
873 proxy_pass http://backend/; |
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874 proxy_store on; |
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|
875 proxy_store_access user:rw group:rw all:r; |
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876 proxy_temp_path /data/temp; |
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|
877 |
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|
878 alias /data/www/; |
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|
879 } |
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|
880 </example> |
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|
881 </para> |
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|
882 |
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|
883 <para> |
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|
884 or like this: |
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|
885 <example> |
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886 location /images/ { |
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|
887 root /data/www; |
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|
888 error_page 404 = @fetch; |
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diff
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|
889 } |
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|
890 |
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|
891 location @fetch { |
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892 internal; |
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|
893 |
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|
894 proxy_pass http://backend; |
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895 proxy_store on; |
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896 proxy_store_access user:rw group:rw all:r; |
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897 proxy_temp_path /data/temp; |
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898 |
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|
899 root /data/www; |
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900 } |
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901 </example> |
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902 </para> |
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903 |
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904 </directive> |
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905 |
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906 |
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907 <directive name="proxy_store_access"> |
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908 <syntax><value>users</value>:<value>permissions</value> ...</syntax> |
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909 <default>user:rw</default> |
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910 <context>http</context> |
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911 <context>server</context> |
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912 <context>location</context> |
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913 |
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914 <para> |
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915 Sets access permissions for newly created files and directories, e.g.: |
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916 <example> |
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917 proxy_store_access user:rw group:rw all:r; |
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918 </example> |
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919 </para> |
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920 |
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921 <para> |
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922 If any <literal>group</literal> or <literal>all</literal> access permissions |
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923 are specified then <literal>user</literal> permissions may be omitted: |
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924 <example> |
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925 proxy_store_access group:rw all:r; |
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926 </example> |
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927 </para> |
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928 |
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929 </directive> |
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930 |
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931 |
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932 <directive name="proxy_temp_path"> |
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933 <syntax> |
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934 <value>path</value> |
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935 [<value>level1</value> |
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936 [<value>level2</value> |
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937 [<value>level3</value>]]]</syntax> |
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938 <default>proxy_temp</default> |
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939 <context>http</context> |
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940 <context>server</context> |
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941 <context>location</context> |
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942 |
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943 <para> |
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944 Defines a directory for storing temporary files |
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945 received from another server. |
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946 Up to three-level subdirectory hierarchy can be used underneath the specified |
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947 directory. |
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948 For example, in the following configuration |
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949 <example> |
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950 proxy_temp_path /spool/nginx/proxy_temp 1 2; |
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951 </example> |
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952 a temporary file might look like this: |
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953 <example> |
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954 /spool/nginx/proxy_temp/<emphasis>7</emphasis>/<emphasis>45</emphasis>/00000123<emphasis>457</emphasis> |
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955 </example> |
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956 </para> |
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957 |
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958 </directive> |
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959 |
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960 </section> |
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961 |
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962 |
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963 <section id="variables" name="Embedded Variables"> |
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964 |
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965 <para> |
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966 The <literal>ngx_http_proxy_module</literal> module supports embedded variables |
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967 that can be used to compose headers using the |
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968 <link id="proxy_set_header"/> directive: |
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969 <list type="tag"> |
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970 |
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971 <tag-name><var>$proxy_host</var></tag-name> |
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972 <tag-desc>name and port of a proxied server;</tag-desc> |
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973 |
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974 <tag-name><var>$proxy_port</var></tag-name> |
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975 <tag-desc>port of a proxied server;</tag-desc> |
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976 |
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977 <tag-name><var>$proxy_add_x_forwarded_for</var></tag-name> |
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978 <tag-desc>the <header>X-Forwarded-For</header> client request header field |
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979 with the <var>$remote_addr</var> variable appended to it, separated by a comma. |
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980 If the <header>X-Forwarded-For</header> field is not present in the client |
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981 request header, the <var>$proxy_add_x_forwarded_for</var> variable is equal |
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982 to the <var>$remote_addr</var> variable.</tag-desc> |
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983 </list> |
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984 </para> |
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985 |
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986 </section> |
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987 |
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988 </module> |