Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_headers_module.xml @ 367:f4033b9bc4ec
- Removed unnecessary instances of unbreakable space.
- Made sure that unbreakable space always precedes "em dash".
author | Ruslan Ermilov <ru@nginx.com> |
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date | Fri, 27 Jan 2012 15:51:39 +0000 |
parents | bb51d3e17dd0 |
children | d4464d7bff6c |
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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 |
364 | 19 |
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20 <section id="example" name="Example Configuration"> |
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21 |
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22 <para> |
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23 <example> |
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24 expires 24h; |
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25 expires modified +24h; |
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26 expires @24h; |
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27 expires 0; |
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28 expires -1; |
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29 expires epoch; |
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30 add_header Cache-Control private; |
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31 </example> |
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32 </para> |
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33 |
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34 </section> |
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35 |
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36 |
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37 <section id="directives" name="Directives"> |
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38 |
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39 <directive name="add_header"> |
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40 <syntax><value>name</value> <value>value</value></syntax> |
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41 <default/> |
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42 <context>http</context> |
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43 <context>server</context> |
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44 <context>location</context> |
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45 |
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46 <para> |
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47 Adds the specified field to a response header provided that |
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48 the response code equals 200, 204, 301, 302, or 304. |
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49 A value can contain variables. |
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50 </para> |
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51 |
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52 </directive> |
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53 |
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54 |
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55 <directive name="expires"> |
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56 <syntax>[<literal>modified</literal>] <value>time</value></syntax> |
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57 <syntax> |
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58 <literal>epoch</literal> | |
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59 <literal>max</literal> | |
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60 <literal>off</literal></syntax> |
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61 <default>off</default> |
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62 <context>http</context> |
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63 <context>server</context> |
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64 <context>location</context> |
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65 |
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66 <para> |
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67 Enables or disables adding or modifying the <header>Expires</header> |
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68 and <header>Cache-Control</header> response header fields. |
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69 A parameter can be a positive or negative |
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70 <link doc="../syntax.xml">time</link>. |
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71 </para> |
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72 |
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73 <para> |
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74 A time in the <header>Expires</header> field is computed as a sum of the |
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75 current time and <value>time</value> specified in the directive. |
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76 If the <literal>modified</literal> parameter is used (0.7.0, 0.6.32) |
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77 then time is computed as a sum of the file’s modification time and |
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78 <value>time</value> specified in the directive. |
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79 </para> |
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80 |
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81 <para> |
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82 In addition, it is possible to specify a time of the day using |
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83 the “<literal>@</literal>” prefix (0.7.9, 0.6.34): |
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84 <example> |
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85 expires @15h30m; |
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86 </example> |
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87 </para> |
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88 |
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89 <para> |
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90 The <literal>epoch</literal> parameter corresponds to the absolute time |
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91 “<literal>Thu, 01 Jan 1970 00:00:01 GMT</literal>”. |
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92 The contents of the <header>Cache-Control</header> field depends |
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93 on the sign of the specified time: |
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94 <list type="bullet"> |
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95 |
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96 <listitem> |
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97 time is negative — <header>Cache-Control: no-cache</header>. |
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98 </listitem> |
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99 |
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100 <listitem> |
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101 time is positive or zero — |
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102 <header>Cache-Control: max-age=<value>t</value></header>, |
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103 where <value>t</value> is a time specified in the directive, in seconds. |
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104 </listitem> |
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105 |
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106 </list> |
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107 </para> |
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108 |
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109 <para> |
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110 The <literal>max</literal> parameter sets <header>Expires</header> |
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111 to the value “<literal>Thu, 31 Dec 2037 23:55:55 GMT</literal>”, |
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112 and <header>Cache-Control</header> to 10 years. |
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113 </para> |
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114 |
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115 <para> |
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116 The <literal>off</literal> parameter disables adding or modifying the |
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117 <header>Expires</header> and <header>Cache-Control</header> response |
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118 header fields. |
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119 </para> |
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120 |
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121 </directive> |
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122 |
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123 </section> |
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124 |
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125 </module> |