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annotate xml/en/docs/http/ngx_http_gzip_module.xml @ 617:368a449e85b8

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Expanded documentation of what various parameters of the "listen" directive related to socket options do. While here, documented the fact that accept filters also work on NetBSD.
author Ruslan Ermilov <ru@nginx.com>
date Thu, 02 Aug 2012 13:24:07 +0000
parents 764fbac1b8b4
children ac709e45740d
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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 rev="1">
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14
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15 <section id="summary">
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16
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17 <para>
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18 The <literal>ngx_http_gzip_module</literal> module is a filter
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19 that compresses responses using the “gzip” method.
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20 This often allows to reduce the size of transmitted data by half or even more.
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21 </para>
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22
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23 </section>
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26 <section id="example" name="Example Configuration">
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27
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28 <para>
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29 <example>
351
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30 gzip on;
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31 gzip_min_length 1000;
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32 gzip_proxied expired no-cache no-store private auth;
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33 gzip_types text/plain application/xml;
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34 </example>
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35 </para>
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36
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37 <para>
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38 The <var>$gzip_ratio</var> variable can be used to log the
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39 achieved compression ratio.
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40 </para>
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41
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42 </section>
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43
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44
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45 <section id="directives" name="Directives">
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46
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47 <directive name="gzip">
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48 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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49 <default>off</default>
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50 <context>http</context>
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51 <context>server</context>
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52 <context>location</context>
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53 <context>if in location</context>
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54
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55 <para>
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56 Enables or disables gzipping of responses.
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57 </para>
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58
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59 </directive>
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61
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62 <directive name="gzip_buffers">
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63 <syntax><value>number</value> <value>size</value></syntax>
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64 <default>32 4k|16 8k</default>
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65 <context>http</context>
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66 <context>server</context>
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67 <context>location</context>
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68
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69 <para>
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70 Sets the <value>number</value> and <value>size</value> of buffers
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71 used to compress a response.
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72 By default, the buffer size is equal to one memory page.
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73 This is either 4K or 8K, depending on a platform.
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74 <note>
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75 Until version 0.7.28, four 4K or 8K buffers were used by default.
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76 </note>
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77 </para>
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78
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79 </directive>
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80
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81
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82 <directive name="gzip_comp_level">
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83
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84 <syntax><value>level</value></syntax>
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85 <default>1</default>
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86 <context>http</context>
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87 <context>server</context>
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88 <context>location</context>
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89
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90 <para>
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91 Sets a gzip compression <value>level</value> of a response.
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92 Acceptable values are in the 1..9 range.
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93 </para>
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94
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95 </directive>
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96
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97
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98 <directive name="gzip_disable">
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99 <syntax><value>regex</value> ...</syntax>
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100 <default/>
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101 <context>http</context>
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102 <context>server</context>
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103 <context>location</context>
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104 <appeared-in>0.6.23</appeared-in>
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105
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106 <para>
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107 Disables gzipping of responses for requests with
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108 <header>User-Agent</header> header fields matching
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109 any of the specified regular expressions.
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110 </para>
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111
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112 <para>
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113 The special mask “<literal>msie6</literal>” (0.7.12) corresponds to
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114 the regular expression “<literal>MSIE [4-6]\.</literal>” but works faster.
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115 Starting from version 0.8.11, “<literal>MSIE 6.0; ... SV1</literal>”
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116 is excluded from this mask.
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117 </para>
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118
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119 </directive>
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120
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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121
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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122 <directive name="gzip_min_length">
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123 <syntax><value>length</value></syntax>
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124 <default>20</default>
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125 <context>http</context>
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126 <context>server</context>
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127 <context>location</context>
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128
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129 <para>
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130 Sets the minimum length of a response that will be gzipped.
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131 The length is determined only from the <header>Content-Length</header>
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132 response header field.
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133 </para>
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134
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135 </directive>
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136
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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137
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138 <directive name="gzip_http_version">
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139 <syntax><literal>1.0</literal> | <literal>1.1</literal></syntax>
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140 <default>1.1</default>
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141 <context>http</context>
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142 <context>server</context>
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143 <context>location</context>
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144
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145 <para>
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146 Sets the minimum HTTP version of a request required to compress a response.
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147 </para>
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148
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149 </directive>
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150
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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151
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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152 <directive name="gzip_proxied">
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153 <syntax>
364
bb51d3e17dd0 Style fixed.
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diff changeset
154 <literal>off</literal> |
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155 <literal>expired</literal> |
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diff changeset
156 <literal>no-cache</literal> |
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diff changeset
157 <literal>no-store</literal> |
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diff changeset
158 <literal>private</literal> |
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159 <literal>no_last_modified</literal> |
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160 <literal>no_etag</literal> |
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diff changeset
161 <literal>auth</literal> |
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162 <literal>any</literal>
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163 ...</syntax>
330
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164 <default>off</default>
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165 <context>http</context>
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166 <context>server</context>
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167 <context>location</context>
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168
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169 <para>
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170 Enables or disables gzipping of responses for proxied
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171 requests depending on the request and response.
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172 The fact that the response is proxied is determined based on
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173 the presence of the <header>Via</header> request header field.
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174 A directive accepts multiple parameters:
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175 <list type="tag">
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176
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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177 <tag-name><literal>off</literal></tag-name>
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178 <tag-desc>
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179 disables compression for all proxied requests,
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180 ignoring other parameters;
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181 </tag-desc>
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182
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183 <tag-name><literal>expired</literal></tag-name>
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184 <tag-desc>
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185 enables compression if a response header includes the field
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186 <header>Expires</header> with a value that disables caching;
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187 </tag-desc>
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188
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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189 <tag-name><literal>no-cache</literal></tag-name>
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190 <tag-desc>
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191 enables compression if a response header includes the field
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192 <header>Cache-Control</header> with the parameter “<literal>no-cache</literal>”;
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193 </tag-desc>
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194
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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195 <tag-name><literal>no-store</literal></tag-name>
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196 <tag-desc>
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197 enables compression if a response header includes the field
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198 <header>Cache-Control</header> with the parameter
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199 “<literal>no-store</literal>”;
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200 </tag-desc>
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201
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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202 <tag-name><literal>private</literal></tag-name>
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203 <tag-desc>
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204 enables compression if a response header includes the field
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205 <header>Cache-Control</header> with the parameter “<literal>private</literal>”;
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206 </tag-desc>
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207
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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208 <tag-name><literal>no_last_modified</literal></tag-name>
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209 <tag-desc>
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210 enables compression if a response header does not include the field
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211 <header>Last-Modified</header>;
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212 </tag-desc>
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213
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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214 <tag-name><literal>no_etag</literal></tag-name>
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215 <tag-desc>
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216 enables compression if a response header does not include the field
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217 <header>ETag</header>;
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218 </tag-desc>
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219
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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220 <tag-name><literal>auth</literal></tag-name>
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221 <tag-desc>
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222 enables compression if a request header includes the field
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223 <header>Authorization</header>;
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224 </tag-desc>
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225
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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226 <tag-name><literal>any</literal></tag-name>
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227 <tag-desc>
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228 enables compression for all proxied requests.
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229 </tag-desc>
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230
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231 </list>
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232 </para>
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233
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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234 </directive>
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235
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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236
f94bcab2a6ae Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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237 <directive name="gzip_types">
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238 <syntax><value>mime-type</value> ...</syntax>
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239 <default>text/html</default>
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240 <context>http</context>
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241 <context>server</context>
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242 <context>location</context>
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243
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244 <para>
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245 Enables gzipping of responses for the specified MIME types in addition
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246 to “<literal>text/html</literal>”.
546
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247 The special value “<literal>*</literal>” matches any MIME type (0.8.29).
330
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248 Responses with the type “<literal>text/html</literal>” are always compressed.
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249 </para>
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250
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251 </directive>
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252
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253
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254 <directive name="gzip_vary">
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255 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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256 <default>off</default>
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257 <context>http</context>
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258 <context>server</context>
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259 <context>location</context>
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260
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261 <para>
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262 Enables or disables emitting the <header>Vary: Accept-Encoding</header>
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263 response header field if the directives
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264 <link id="gzip"/> or
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265 <link doc="ngx_http_gzip_static_module.xml" id="gzip_static"/>
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266 are active.
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267 </para>
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268
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269 </directive>
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270
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271 </section>
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272
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273 </module>