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annotate xml/en/docs/http/ngx_http_headers_module.xml @ 1291:d7740f42b00a

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Headers: documented the "always" parameter of the "add_header" directive.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 16 Sep 2014 12:27:55 +0400
parents b841fbb8c577
children ab0ebdd7ddac
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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 rev="6">
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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_headers_module</literal> module allows adding
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19 the <header>Expires</header> and <header>Cache-Control</header> header
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20 fields, and arbitrary fields, to a response header.
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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 expires 24h;
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31 expires modified +24h;
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32 expires @24h;
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33 expires 0;
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34 expires -1;
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35 expires epoch;
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36 add_header Cache-Control private;
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37 </example>
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38 </para>
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39
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40 </section>
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41
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42
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43 <section id="directives" name="Directives">
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44
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45 <directive name="add_header">
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46 <syntax>
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47 <value>name</value> <value>value</value>
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48 [<literal>always</literal>]</syntax>
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49 <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 Adds the specified field to a response header provided that
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57 the response code equals 200, 201, 204, 206, 301, 302, 303, 304, or 307.
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58 A value can contain variables.
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59 </para>
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60
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61 <para>
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62 There could be several <literal>add_header</literal> directives.
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63 These directives are inherited from the previous level if and
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64 only if there are no
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65 <literal>add_header</literal>
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66 directives defined on the current level.
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67 </para>
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68
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69 <para>
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70 If the <literal>always</literal> parameter is specified (1.7.5),
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71 the header field will be added regardless of the response code.
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72 </para>
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73
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74 </directive>
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75
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76
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77 <directive name="expires">
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78 <syntax>[<literal>modified</literal>] <value>time</value></syntax>
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79 <syntax>
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80 <literal>epoch</literal> |
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81 <literal>max</literal> |
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82 <literal>off</literal></syntax>
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83 <default>off</default>
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84 <context>http</context>
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85 <context>server</context>
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86 <context>location</context>
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87 <context>if in location</context>
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88
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89 <para>
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90 Enables or disables adding or modifying the <header>Expires</header>
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91 and <header>Cache-Control</header> response header fields provided that
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92 the response code equals 200, 201, 204, 206, 301, 302, 303, 304, or 307.
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93 A parameter can be a positive or negative
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94 <link doc="../syntax.xml">time</link>.
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95 </para>
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96
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97 <para>
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98 A time in the <header>Expires</header> field is computed as a sum of the
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99 current time and <value>time</value> specified in the directive.
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100 If the <literal>modified</literal> parameter is used (0.7.0, 0.6.32)
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101 then time is computed as a sum of the file’s modification time and
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102 <value>time</value> specified in the directive.
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103 </para>
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104
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105 <para>
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106 In addition, it is possible to specify a time of the day using
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107 the “<literal>@</literal>” prefix (0.7.9, 0.6.34):
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108 <example>
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109 expires @15h30m;
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110 </example>
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111 </para>
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112
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113 <para>
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114 The <literal>epoch</literal> parameter corresponds to the absolute time
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115 “<literal>Thu, 01 Jan 1970 00:00:01 GMT</literal>”.
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116 The contents of the <header>Cache-Control</header> field depends
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117 on the sign of the specified time:
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118 <list type="bullet">
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119
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120 <listitem>
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121 time is negative — <header>Cache-Control: no-cache</header>.
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122 </listitem>
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123
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124 <listitem>
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125 time is positive or zero —
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126 <header>Cache-Control: max-age=<value>t</value></header>,
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127 where <value>t</value> is a time specified in the directive, in seconds.
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128 </listitem>
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129
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130 </list>
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131 </para>
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132
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133 <para>
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134 The <literal>max</literal> parameter sets <header>Expires</header>
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135 to the value “<literal>Thu, 31 Dec 2037 23:55:55 GMT</literal>”,
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136 and <header>Cache-Control</header> to 10 years.
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137 </para>
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138
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139 <para>
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140 The <literal>off</literal> parameter disables adding or modifying the
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141 <header>Expires</header> and <header>Cache-Control</header> response
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142 header fields.
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143 </para>
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144
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145 </directive>
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146
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147 </section>
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148
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149 </module>