Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_gzip_module.xml @ 1393:15e8779f0ceb
Documented the $upstream_header_time variable.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Mon, 19 Jan 2015 15:24:15 +0300 |
parents | 6d51bb4f19f7 |
children | ca7568f67dee |
rev | line source |
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330
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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" |
589 | 12 lang="en" |
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13 rev="4"> |
330
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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. |
966 | 20 This often helps to reduce the size of transmitted data by half or even more. |
330
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21 </para> |
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22 |
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23 </section> |
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24 |
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25 |
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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> |
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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; |
330
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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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60 |
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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. |
966 | 92 Acceptable values are in the range from 1 to 9. |
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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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changeset
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109 any of the specified regular expressions. |
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parents:
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changeset
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110 </para> |
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parents:
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changeset
|
111 |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
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changeset
|
112 <para> |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
113 The special mask “<literal>msie6</literal>” (0.7.12) corresponds to |
966 | 114 the regular expression “<literal>MSIE [4-6]\.</literal>”, but works faster. |
330
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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changeset
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115 Starting from version 0.8.11, “<literal>MSIE 6.0; ... SV1</literal>” |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
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changeset
|
116 is excluded from this mask. |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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117 </para> |
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changeset
|
118 |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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changeset
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119 </directive> |
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120 |
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121 |
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122 <directive name="gzip_min_length"> |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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123 <syntax><value>length</value></syntax> |
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124 <default>20</default> |
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changeset
|
125 <context>http</context> |
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changeset
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126 <context>server</context> |
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127 <context>location</context> |
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changeset
|
128 |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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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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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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132 response header field. |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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133 </para> |
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134 |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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135 </directive> |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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changeset
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136 |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
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137 |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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changeset
|
138 <directive name="gzip_http_version"> |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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|
139 <syntax><literal>1.0</literal> | <literal>1.1</literal></syntax> |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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140 <default>1.1</default> |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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changeset
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141 <context>http</context> |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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142 <context>server</context> |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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143 <context>location</context> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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|
144 |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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145 <para> |
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|
146 Sets the minimum HTTP version of a request required to compress a response. |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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147 </para> |
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|
148 |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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|
149 </directive> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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|
150 |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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changeset
|
151 |
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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 | 154 <literal>off</literal> | |
155 <literal>expired</literal> | | |
156 <literal>no-cache</literal> | | |
157 <literal>no-store</literal> | | |
158 <literal>private</literal> | | |
159 <literal>no_last_modified</literal> | | |
160 <literal>no_etag</literal> | | |
161 <literal>auth</literal> | | |
162 <literal>any</literal> | |
163 ...</syntax> | |
330
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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164 <default>off</default> |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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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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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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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. |
1248
6d51bb4f19f7
Gzip: fixed minor flaws in the "gzip_proxied" directive.
Gunnlaugur Thor Briem <gunnlaugur@gmail.com>
parents:
966
diff
changeset
|
172 The fact that the request is proxied is determined by |
330
f94bcab2a6ae
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173 the presence of the <header>Via</header> request header field. |
1248
6d51bb4f19f7
Gzip: fixed minor flaws in the "gzip_proxied" directive.
Gunnlaugur Thor Briem <gunnlaugur@gmail.com>
parents:
966
diff
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|
174 The directive accepts multiple parameters: |
330
f94bcab2a6ae
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|
175 <list type="tag"> |
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176 |
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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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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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178 <tag-desc> |
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179 disables compression for all proxied requests, |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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|
180 ignoring other parameters; |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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|
181 </tag-desc> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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|
182 |
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Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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changeset
|
183 <tag-name><literal>expired</literal></tag-name> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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diff
changeset
|
184 <tag-desc> |
966 | 185 enables compression if a response header includes the |
186 <header>Expires</header> field with a value that disables caching; | |
330
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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|
187 </tag-desc> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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changeset
|
188 |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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diff
changeset
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189 <tag-name><literal>no-cache</literal></tag-name> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
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changeset
|
190 <tag-desc> |
966 | 191 enables compression if a response header includes the |
192 <header>Cache-Control</header> field with the | |
193 “<literal>no-cache</literal>” parameter; | |
330
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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|
194 </tag-desc> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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changeset
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195 |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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changeset
|
196 <tag-name><literal>no-store</literal></tag-name> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
197 <tag-desc> |
966 | 198 enables compression if a response header includes the |
199 <header>Cache-Control</header> field with the | |
200 “<literal>no-store</literal>” parameter; | |
330
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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diff
changeset
|
201 </tag-desc> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
202 |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
203 <tag-name><literal>private</literal></tag-name> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
204 <tag-desc> |
966 | 205 enables compression if a response header includes the |
206 <header>Cache-Control</header> field with the | |
207 “<literal>private</literal>” parameter; | |
330
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
208 </tag-desc> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
209 |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
210 <tag-name><literal>no_last_modified</literal></tag-name> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
211 <tag-desc> |
966 | 212 enables compression if a response header does not include the |
213 <header>Last-Modified</header> field; | |
330
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
214 </tag-desc> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
215 |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
216 <tag-name><literal>no_etag</literal></tag-name> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
217 <tag-desc> |
966 | 218 enables compression if a response header does not include the |
219 <header>ETag</header> field; | |
330
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
220 </tag-desc> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
221 |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
222 <tag-name><literal>auth</literal></tag-name> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
223 <tag-desc> |
966 | 224 enables compression if a request header includes the |
225 <header>Authorization</header> field; | |
330
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
226 </tag-desc> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
227 |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
228 <tag-name><literal>any</literal></tag-name> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
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changeset
|
229 <tag-desc> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
230 enables compression for all proxied requests. |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
231 </tag-desc> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
232 |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
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parents:
diff
changeset
|
233 </list> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
234 </para> |
f94bcab2a6ae
Translated ngx_http_gzip_module and ngx_http_gzip_static_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
235 |
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236 </directive> |
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237 |
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238 |
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239 <directive name="gzip_types"> |
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240 <syntax><value>mime-type</value> ...</syntax> |
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241 <default>text/html</default> |
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242 <context>http</context> |
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243 <context>server</context> |
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244 <context>location</context> |
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245 |
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246 <para> |
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247 Enables gzipping of responses for the specified MIME types in addition |
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248 to “<literal>text/html</literal>”. |
546
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249 The special value “<literal>*</literal>” matches any MIME type (0.8.29). |
966 | 250 Responses with the “<literal>text/html</literal>” type are always compressed. |
330
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251 </para> |
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252 |
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253 </directive> |
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254 |
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255 |
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256 <directive name="gzip_vary"> |
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257 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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258 <default>off</default> |
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259 <context>http</context> |
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260 <context>server</context> |
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261 <context>location</context> |
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262 |
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263 <para> |
966 | 264 Enables or disables inserting the <header>Vary: Accept-Encoding</header> |
330
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265 response header field if the directives |
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266 <link id="gzip"/>, |
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267 <link doc="ngx_http_gzip_static_module.xml" id="gzip_static"/>, or |
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268 <link doc="ngx_http_gunzip_module.xml" id="gunzip"/> |
330
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269 are active. |
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270 </para> |
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271 |
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272 </directive> |
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273 |
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274 </section> |
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275 |
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276 |
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277 <section id="variables" name="Embedded Variables"> |
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278 |
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279 <para> |
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280 <list type="tag"> |
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281 |
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282 <tag-name id="var_gzip_ratio"><var>$gzip_ratio</var></tag-name> |
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283 <tag-desc>achieved compression ratio, computed as the ratio between the |
966 | 284 original and compressed response sizes.</tag-desc> |
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285 |
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286 </list> |
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287 </para> |
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288 |
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289 </section> |
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290 |
330
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291 </module> |