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annotate xml/ru/docs/http/ngx_http_headers_module.xml @ 770:a879f261f3db

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Reduced unnecessary diffs between "add_header" and "expires" texts.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 20 Nov 2012 06:52:11 +0000
parents 3974a50b2142
children b4fc7d571e48
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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="Модуль ngx_http_headers_module"
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11 link="/ru/docs/http/ngx_http_headers_module.html"
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12 lang="ru"
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13 rev="3">
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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 Модуль <literal>ngx_http_headers_module</literal> позволяет выдавать
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19 поля заголовка <header>Expires</header> и <header>Cache-Control</header>,
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20 а также добавлять произвольные поля в заголовок ответа.
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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="Пример конфигурации">
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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="Директивы">
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44
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45 <directive name="add_header">
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46 <syntax><value>имя</value> <value>значение</value></syntax>
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47 <default/>
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48 <context>http</context>
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49 <context>server</context>
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50 <context>location</context>
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51 <context>if в location</context>
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52
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53 <para>
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54 Добавляет указанное поле в заголовок ответа при условии, что код ответа
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55 равен 200, 204, 206, 301, 302, 303, 304 или 307.
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56 В значении можно использовать переменные.
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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="expires">
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63 <syntax>[<literal>modified</literal>] <value>время</value></syntax>
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64 <syntax>
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65 <literal>epoch</literal> |
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66 <literal>max</literal> |
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67 <literal>off</literal></syntax>
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68 <default>off</default>
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69 <context>http</context>
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70 <context>server</context>
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71 <context>location</context>
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72 <context>if в location</context>
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74 <para>
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75 Разрешает или запрещает добавлять или менять поля <header>Expires</header>
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76 и <header>Cache-Control</header> в заголовке ответа при условии, что код ответа
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77 равен 200, 204, 206, 301, 302, 303, 304 или 307.
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78 В качестве параметра можно задать положительное или отрицательное
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79 <link doc="../syntax.xml">время</link>.
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80 </para>
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81
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82 <para>
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83 Время в поле <header>Expires</header> получается как сумма текущего времени
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84 и времени, заданного в директиве.
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85 Если используется параметр <literal>modified</literal> (0.7.0, 0.6.32),
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86 то время получается как сумма
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87 времени модификации файла и времени, заданного в директиве.
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88 </para>
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89
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90 <para>
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91 Кроме того, с помощью префикса “<literal>@</literal>” можно задать
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92 время суток (0.7.9, 0.6.34):
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93 <example>
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94 expires @15h30m;
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95 </example>
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96 </para>
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97
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98 <para>
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99 Параметр <literal>epoch</literal> соответствует абсолютному времени
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100 “<literal>Thu, 01 Jan 1970 00:00:01 GMT</literal>”
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101 (1 января 1970 года 00:00:01 GMT).
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102 Содержимое поля <header>Cache-Control</header> зависит от знака
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103 заданного времени:
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104 <list type="bullet">
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105
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106 <listitem>
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107 отрицательное время — <header>Cache-Control: no-cache</header>.
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108 </listitem>
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109
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110 <listitem>
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111 положительное или равное нулю время —
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112 <header>Cache-Control: max-age=<value>t</value></header>,
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113 где <value>t</value> это время в секундах, заданное в директиве.
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114 </listitem>
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115
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116 </list>
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117 </para>
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118
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119 <para>
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120 Параметр <literal>max</literal> задаёт время
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121 “<literal>Thu, 31 Dec 2037 23:55:55 GMT</literal>”
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122 (31 декабря 2037 23:55:55 GMT) для поля <header>Expires</header>
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123 и 10 лет для поля <header>Cache-Control</header>.
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124 </para>
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125
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126 <para>
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127 Параметр <literal>off</literal> запрещает добавлять или менять поля
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128 <header>Expires</header> и <header>Cache-Control</header> в заголовке ответа.
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129 </para>
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130
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131 </directive>
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132
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133 </section>
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134
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135 </module>