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annotate xml/en/docs/http/ngx_http_gzip_module.xml @ 580:be54c443235a

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Added copyright markers to documentation sources.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 10 Jul 2012 12:59:42 +0000
parents 694db9597ee0
children 764fbac1b8b4
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330
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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1 <?xml version="1.0"?>
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2
580
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_http_gzip_module"
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11 link="/en/docs/http/ngx_http_gzip_module.html"
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12 lang="en">
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13
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14 <section id="summary">
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15
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16 <para>
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17 The <literal>ngx_http_gzip_module</literal> module is a filter
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18 that compresses responses using the “gzip” method.
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19 This often allows to reduce the size of transmitted data by half or even more.
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20 </para>
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21
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22 </section>
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23
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24
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25 <section id="example" name="Example Configuration">
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26
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27 <para>
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28 <example>
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29 gzip on;
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30 gzip_min_length 1000;
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31 gzip_proxied expired no-cache no-store private auth;
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32 gzip_types text/plain application/xml;
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33 </example>
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34 </para>
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35
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36 <para>
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37 The <var>$gzip_ratio</var> variable can be used to log the
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38 achieved compression ratio.
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39 </para>
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40
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41 </section>
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42
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43
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44 <section id="directives" name="Directives">
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45
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46 <directive name="gzip">
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47 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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48 <default>off</default>
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49 <context>http</context>
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50 <context>server</context>
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51 <context>location</context>
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52 <context>if in location</context>
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53
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54 <para>
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55 Enables or disables gzipping of responses.
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56 </para>
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57
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58 </directive>
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59
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60
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61 <directive name="gzip_buffers">
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62 <syntax><value>number</value> <value>size</value></syntax>
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63 <default>32 4k|16 8k</default>
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64 <context>http</context>
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65 <context>server</context>
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66 <context>location</context>
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67
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68 <para>
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69 Sets the <value>number</value> and <value>size</value> of buffers
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70 used to compress a response.
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71 By default, the buffer size is equal to one memory page.
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72 This is either 4K or 8K, depending on a platform.
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73 <note>
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74 Until version 0.7.28, four 4K or 8K buffers were used by default.
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75 </note>
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76 </para>
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77
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78 </directive>
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79
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80
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81 <directive name="gzip_comp_level">
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82
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83 <syntax><value>level</value></syntax>
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84 <default>1</default>
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85 <context>http</context>
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86 <context>server</context>
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87 <context>location</context>
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88
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89 <para>
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90 Sets a gzip compression <value>level</value> of a response.
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91 Acceptable values are in the 1..9 range.
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92 </para>
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93
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94 </directive>
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95
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96
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97 <directive name="gzip_disable">
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98 <syntax><value>regex</value> ...</syntax>
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99 <default/>
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100 <context>http</context>
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101 <context>server</context>
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102 <context>location</context>
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103 <appeared-in>0.6.23</appeared-in>
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104
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105 <para>
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106 Disables gzipping of responses for requests with
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107 <header>User-Agent</header> header fields matching
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108 any of the specified regular expressions.
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109 </para>
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110
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111 <para>
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112 The special mask “<literal>msie6</literal>” (0.7.12) corresponds to
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113 the regular expression “<literal>MSIE [4-6]\.</literal>” but works faster.
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114 Starting from version 0.8.11, “<literal>MSIE 6.0; ... SV1</literal>”
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115 is excluded from this mask.
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116 </para>
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117
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118 </directive>
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119
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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120
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121 <directive name="gzip_min_length">
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122 <syntax><value>length</value></syntax>
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123 <default>20</default>
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124 <context>http</context>
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125 <context>server</context>
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126 <context>location</context>
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127
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128 <para>
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129 Sets the minimum length of a response that will be gzipped.
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130 The length is determined only from the <header>Content-Length</header>
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131 response header field.
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132 </para>
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133
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134 </directive>
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135
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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136
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137 <directive name="gzip_http_version">
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138 <syntax><literal>1.0</literal> | <literal>1.1</literal></syntax>
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139 <default>1.1</default>
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140 <context>http</context>
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141 <context>server</context>
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142 <context>location</context>
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143
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144 <para>
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145 Sets the minimum HTTP version of a request required to compress a response.
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146 </para>
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147
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148 </directive>
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149
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150
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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151 <directive name="gzip_proxied">
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152 <syntax>
364
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diff changeset
153 <literal>off</literal> |
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154 <literal>expired</literal> |
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diff changeset
155 <literal>no-cache</literal> |
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156 <literal>no-store</literal> |
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diff changeset
157 <literal>private</literal> |
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diff changeset
158 <literal>no_last_modified</literal> |
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159 <literal>no_etag</literal> |
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diff changeset
160 <literal>auth</literal> |
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diff changeset
161 <literal>any</literal>
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162 ...</syntax>
330
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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 Enables or disables gzipping of responses for proxied
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170 requests depending on the request and response.
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171 The fact that the response is proxied is determined based on
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172 the presence of the <header>Via</header> request header field.
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173 A directive accepts multiple parameters:
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174 <list type="tag">
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175
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176 <tag-name><literal>off</literal></tag-name>
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177 <tag-desc>
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178 disables compression for all proxied requests,
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179 ignoring other parameters;
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180 </tag-desc>
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181
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182 <tag-name><literal>expired</literal></tag-name>
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183 <tag-desc>
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184 enables compression if a response header includes the field
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185 <header>Expires</header> with a value that disables caching;
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186 </tag-desc>
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187
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188 <tag-name><literal>no-cache</literal></tag-name>
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189 <tag-desc>
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190 enables compression if a response header includes the field
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191 <header>Cache-Control</header> with the parameter “<literal>no-cache</literal>”;
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192 </tag-desc>
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193
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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194 <tag-name><literal>no-store</literal></tag-name>
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195 <tag-desc>
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196 enables compression if a response header includes the field
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197 <header>Cache-Control</header> with the parameter
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198 “<literal>no-store</literal>”;
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199 </tag-desc>
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200
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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201 <tag-name><literal>private</literal></tag-name>
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202 <tag-desc>
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203 enables compression if a response header includes the field
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204 <header>Cache-Control</header> with the parameter “<literal>private</literal>”;
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205 </tag-desc>
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206
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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207 <tag-name><literal>no_last_modified</literal></tag-name>
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208 <tag-desc>
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209 enables compression if a response header does not include the field
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210 <header>Last-Modified</header>;
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211 </tag-desc>
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212
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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213 <tag-name><literal>no_etag</literal></tag-name>
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214 <tag-desc>
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215 enables compression if a response header does not include the field
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216 <header>ETag</header>;
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217 </tag-desc>
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218
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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219 <tag-name><literal>auth</literal></tag-name>
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220 <tag-desc>
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221 enables compression if a request header includes the field
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222 <header>Authorization</header>;
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223 </tag-desc>
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224
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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225 <tag-name><literal>any</literal></tag-name>
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226 <tag-desc>
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227 enables compression for all proxied requests.
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228 </tag-desc>
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229
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230 </list>
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231 </para>
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232
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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233 </directive>
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234
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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235
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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236 <directive name="gzip_types">
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237 <syntax><value>mime-type</value> ...</syntax>
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238 <default>text/html</default>
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239 <context>http</context>
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240 <context>server</context>
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241 <context>location</context>
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242
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243 <para>
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244 Enables gzipping of responses for the specified MIME types in addition
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245 to “<literal>text/html</literal>”.
546
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246 The special value “<literal>*</literal>” matches any MIME type (0.8.29).
330
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247 Responses with the type “<literal>text/html</literal>” are always compressed.
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248 </para>
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249
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250 </directive>
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251
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252
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253 <directive name="gzip_vary">
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254 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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255 <default>off</default>
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256 <context>http</context>
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257 <context>server</context>
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258 <context>location</context>
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259
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260 <para>
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261 Enables or disables emitting the <header>Vary: Accept-Encoding</header>
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262 response header field if the directives
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263 <link id="gzip"/> or
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264 <link doc="ngx_http_gzip_static_module.xml" id="gzip_static"/>
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265 are active.
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266 </para>
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267
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268 </directive>
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269
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270 </section>
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271
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272 </module>