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annotate xml/en/docs/http/ngx_http_headers_module.xml @ 353:7b6155ac373b

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Revised the Russian version of ngx_http_headers_module and translated it into English.
author Ruslan Ermilov <ru@nginx.com>
date Wed, 25 Jan 2012 13:22:09 +0000
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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_headers_module"
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6 link="/en/docs/http/ngx_http_headers_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_headers_module</literal> module allows to emit
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13 the <header>Expires</header> and <header>Cache-Control</header> header
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14 fields, and to add arbitrary fields to a response header.
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15 </para>
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16
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17 </section>
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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 expires 24h;
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24 expires modified +24h;
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25 expires @24h;
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26 expires 0;
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27 expires -1;
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28 expires epoch;
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29 add_header Cache-Control private;
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30 </example>
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31 </para>
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32
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33 </section>
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34
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35
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36 <section id="directives" name="Directives">
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37
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38 <directive name="add_header">
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39 <syntax><value>name</value> <value>value</value></syntax>
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40 <default/>
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41 <context>http</context>
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42 <context>server</context>
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43 <context>location</context>
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44
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45 <para>
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46 Adds the specified field to a response header provided that
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47 the response code equals 200, 204, 301, 302, or 304.
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48 A value can contain variables.
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49 </para>
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50
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51 </directive>
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52
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53
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54 <directive name="expires">
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55 <syntax>[<literal>modified</literal>] <value>time</value></syntax>
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56 <syntax>
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57 <literal>epoch</literal> |
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58 <literal>max</literal> |
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59 <literal>off</literal></syntax>
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60 <default>off</default>
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61 <context>http</context>
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62 <context>server</context>
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63 <context>location</context>
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64
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65 <para>
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66 Enables or disables adding or modifying the <header>Expires</header>
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67 and <header>Cache-Control</header> response header fields.
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68 A parameter can be a positive or negative
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69 <link doc="../syntax.xml">time</link>.
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70 </para>
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71
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72 <para>
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73 A time in the <header>Expires</header> field is computed as a sum of the
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74 current time and <value>time</value> specified in the directive.
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75 If the <literal>modified</literal> parameter is used (0.7.0, 0.6.32)
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76 then time is computed as a sum of the file’s modification time and
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77 <value>time</value> specified in the directive.
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78 </para>
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79
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80 <para>
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81 In addition, it is possible to specify a time of the day using
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82 the “<literal>@</literal>” prefix (0.7.9, 0.6.34):
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83 <example>
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84 expires @15h30m;
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85 </example>
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86 </para>
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87
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88 <para>
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89 The <literal>epoch</literal> parameter corresponds to the absolute time
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90 “<literal>Thu, 01 Jan 1970 00:00:01 GMT</literal>”.
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91 The contents of the <header>Cache-Control</header> field depends
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92 on the sign of the specified time:
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93 <list type="bullet">
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94
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95 <listitem>
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96 time is negative — <header>Cache-Control: no-cache</header>.
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97 </listitem>
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98
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99 <listitem>
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100 time is positive or zero —
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101 <header>Cache-Control: max-age=<value>t</value></header>,
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102 where <value>t</value> is a time specified in the directive, in seconds.
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103 </listitem>
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104
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105 </list>
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106 </para>
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107
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108 <para>
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109 The <literal>max</literal> parameter sets <header>Expires</header>
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110 to the value “<literal>Thu, 31 Dec 2037 23:55:55 GMT</literal>”,
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111 and <header>Cache-Control</header> to 10 years.
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112 </para>
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113
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114 <para>
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115 The <literal>off</literal> parameter disables adding or modifying the
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116 <header>Expires</header> and <header>Cache-Control</header> response
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117 header fields.
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118 </para>
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119
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120 </directive>
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121
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122 </section>
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123
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124 </module>