Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_headers_module.xml @ 2635:bf8e98fe085f
Linux packages: use $releasever_major in SLES repository instructions.
On SLES service packs, $releasever holds a major number (e.g. 12), a dot and a
minor number of a service pack (e.g. 5). Since we don't ship packages per-SP
for that distribution, but rather the lowest common, we should point our users
accordingly.
author | Konstantin Pavlov <thresh@nginx.com> |
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date | Tue, 08 Dec 2020 14:07:49 +0300 |
parents | eeed494bba51 |
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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" |
589 | 12 lang="en" |
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13 rev="13"> |
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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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19 the <header>Expires</header> and <header>Cache-Control</header> header |
966 | 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 |
364 | 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 expires $expires; |
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37 add_header Cache-Control private; |
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38 </example> |
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39 </para> |
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40 |
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41 </section> |
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42 |
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43 |
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44 <section id="directives" name="Directives"> |
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45 |
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46 <directive name="add_header"> |
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47 <syntax> |
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48 <value>name</value> <value>value</value> |
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49 [<literal>always</literal>]</syntax> |
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50 <default/> |
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51 <context>http</context> |
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52 <context>server</context> |
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53 <context>location</context> |
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54 <context>if in location</context> |
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55 |
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56 <para> |
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57 Adds the specified field to a response header provided that |
2039
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58 the response code equals 200, 201 (1.3.10), 204, 206, 301, 302, 303, 304, |
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59 307 (1.1.16, 1.0.13), or 308 (1.13.0). |
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60 Parameter value can contain variables. |
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61 </para> |
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62 |
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63 <para> |
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64 There could be several <literal>add_header</literal> directives. |
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65 These directives are inherited from the previous configuration level |
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66 if and only if there are no <literal>add_header</literal> directives |
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67 defined on the current level. |
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68 </para> |
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69 |
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70 <para> |
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71 If the <literal>always</literal> parameter is specified (1.7.5), |
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72 the header field will be added regardless of the response code. |
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73 </para> |
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74 |
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75 </directive> |
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76 |
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77 |
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78 <directive name="add_trailer"> |
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79 <syntax> |
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80 <value>name</value> <value>value</value> |
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81 [<literal>always</literal>]</syntax> |
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82 <default/> |
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83 <context>http</context> |
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84 <context>server</context> |
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85 <context>location</context> |
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86 <context>if in location</context> |
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87 <appeared-in>1.13.2</appeared-in> |
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88 |
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89 <para> |
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90 Adds the specified field to the end of a response provided that |
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91 the response code equals 200, 201, 206, 301, 302, 303, 307, or 308. |
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92 Parameter value can contain variables. |
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93 </para> |
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94 |
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95 <para> |
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96 There could be several <literal>add_trailer</literal> directives. |
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97 These directives are inherited from the previous configuration level |
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98 if and only if there are no <literal>add_trailer</literal> directives |
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99 defined on the current level. |
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100 </para> |
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101 |
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102 <para> |
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103 If the <literal>always</literal> parameter is specified |
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104 the specified field will be added regardless of the response code. |
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105 </para> |
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106 |
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107 </directive> |
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108 |
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109 |
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110 <directive name="expires"> |
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111 <syntax>[<literal>modified</literal>] <value>time</value></syntax> |
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112 <syntax> |
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113 <literal>epoch</literal> | |
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114 <literal>max</literal> | |
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115 <literal>off</literal></syntax> |
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116 <default>off</default> |
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117 <context>http</context> |
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118 <context>server</context> |
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119 <context>location</context> |
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120 <context>if in location</context> |
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121 |
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122 <para> |
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123 Enables or disables adding or modifying the <header>Expires</header> |
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124 and <header>Cache-Control</header> response header fields provided that |
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125 the response code equals 200, 201 (1.3.10), 204, 206, 301, 302, 303, 304, |
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126 307 (1.1.16, 1.0.13), or 308 (1.13.0). |
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127 The parameter can be a positive or negative |
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128 <link doc="../syntax.xml">time</link>. |
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129 </para> |
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130 |
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131 <para> |
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132 The time in the <header>Expires</header> field is computed as a sum of the |
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133 current time and <value>time</value> specified in the directive. |
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134 If the <literal>modified</literal> parameter is used (0.7.0, 0.6.32) |
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135 then the time is computed as a sum of the file’s modification time and |
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136 the <value>time</value> specified in the directive. |
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137 </para> |
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138 |
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139 <para> |
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140 In addition, it is possible to specify a time of day using |
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141 the “<literal>@</literal>” prefix (0.7.9, 0.6.34): |
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142 <example> |
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143 expires @15h30m; |
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144 </example> |
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145 </para> |
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146 |
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147 <para> |
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148 The contents of the <header>Cache-Control</header> field depends |
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149 on the sign of the specified time: |
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150 <list type="bullet"> |
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151 |
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152 <listitem> |
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153 time is negative — <header>Cache-Control: no-cache</header>. |
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154 </listitem> |
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155 |
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156 <listitem> |
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157 time is positive or zero — |
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158 <header>Cache-Control: max-age=<value>t</value></header>, |
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159 where <value>t</value> is a time specified in the directive, in seconds. |
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160 </listitem> |
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161 |
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162 </list> |
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163 </para> |
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164 |
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165 <para> |
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166 The <literal>epoch</literal> parameter sets <header>Expires</header> |
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167 to the value “<literal>Thu, 01 Jan 1970 00:00:01 GMT</literal>”, |
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168 and <header>Cache-Control</header> to “<literal>no-cache</literal>”. |
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169 </para> |
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170 |
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171 <para> |
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172 The <literal>max</literal> parameter sets <header>Expires</header> |
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173 to the value “<literal>Thu, 31 Dec 2037 23:55:55 GMT</literal>”, |
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174 and <header>Cache-Control</header> to 10 years. |
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175 </para> |
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176 |
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177 <para> |
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178 The <literal>off</literal> parameter disables adding or modifying the |
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179 <header>Expires</header> and <header>Cache-Control</header> response |
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180 header fields. |
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181 </para> |
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182 |
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183 <para> |
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184 The last parameter value can contain variables (1.7.9): |
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185 <example> |
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186 map $sent_http_content_type $expires { |
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187 default off; |
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188 application/pdf 42d; |
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189 ~image/ max; |
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190 } |
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191 |
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192 expires $expires; |
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193 </example> |
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194 </para> |
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195 |
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196 </directive> |
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197 |
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198 </section> |
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199 |
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200 </module> |