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annotate xml/en/docs/http/ngx_http_headers_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 d4464d7bff6c
children 764fbac1b8b4
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1 <?xml version="1.0"?>
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2
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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_headers_module"
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11 link="/en/docs/http/ngx_http_headers_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_headers_module</literal> module allows to emit
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18 the <header>Expires</header> and <header>Cache-Control</header> header
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19 fields, and to add arbitrary fields to a response header.
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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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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 expires 24h;
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30 expires modified +24h;
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31 expires @24h;
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32 expires 0;
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33 expires -1;
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34 expires epoch;
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35 add_header Cache-Control private;
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36 </example>
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37 </para>
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38
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39 </section>
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41
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42 <section id="directives" name="Directives">
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43
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44 <directive name="add_header">
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45 <syntax><value>name</value> <value>value</value></syntax>
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46 <default/>
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47 <context>http</context>
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48 <context>server</context>
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49 <context>location</context>
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50
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51 <para>
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52 Adds the specified field to a response header provided that
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53 the response code equals 200, 204, 206, 301, 302, 303, 304, or 307.
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54 A value can contain variables.
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55 </para>
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56
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57 </directive>
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59
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60 <directive name="expires">
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61 <syntax>[<literal>modified</literal>] <value>time</value></syntax>
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62 <syntax>
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63 <literal>epoch</literal> |
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64 <literal>max</literal> |
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65 <literal>off</literal></syntax>
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66 <default>off</default>
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67 <context>http</context>
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68 <context>server</context>
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69 <context>location</context>
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70
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71 <para>
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72 Enables or disables adding or modifying the <header>Expires</header>
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73 and <header>Cache-Control</header> response header fields.
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74 A parameter can be a positive or negative
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75 <link doc="../syntax.xml">time</link>.
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76 </para>
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77
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78 <para>
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79 A time in the <header>Expires</header> field is computed as a sum of the
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80 current time and <value>time</value> specified in the directive.
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81 If the <literal>modified</literal> parameter is used (0.7.0, 0.6.32)
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82 then time is computed as a sum of the file’s modification time and
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83 <value>time</value> specified in the directive.
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84 </para>
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85
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86 <para>
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87 In addition, it is possible to specify a time of the day using
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88 the “<literal>@</literal>” prefix (0.7.9, 0.6.34):
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89 <example>
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90 expires @15h30m;
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91 </example>
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92 </para>
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93
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94 <para>
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95 The <literal>epoch</literal> parameter corresponds to the absolute time
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96 “<literal>Thu, 01 Jan 1970 00:00:01 GMT</literal>”.
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97 The contents of the <header>Cache-Control</header> field depends
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98 on the sign of the specified time:
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99 <list type="bullet">
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100
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101 <listitem>
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102 time is negative — <header>Cache-Control: no-cache</header>.
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103 </listitem>
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104
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105 <listitem>
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106 time is positive or zero —
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107 <header>Cache-Control: max-age=<value>t</value></header>,
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108 where <value>t</value> is a time specified in the directive, in seconds.
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109 </listitem>
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110
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111 </list>
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112 </para>
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113
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114 <para>
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115 The <literal>max</literal> parameter sets <header>Expires</header>
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116 to the value “<literal>Thu, 31 Dec 2037 23:55:55 GMT</literal>”,
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117 and <header>Cache-Control</header> to 10 years.
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118 </para>
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119
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120 <para>
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121 The <literal>off</literal> parameter disables adding or modifying the
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122 <header>Expires</header> and <header>Cache-Control</header> response
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123 header fields.
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124 </para>
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125
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126 </directive>
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127
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128 </section>
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129
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130 </module>