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comparison xml/en/docs/http/ngx_http_headers_module.xml @ 2311:6ca49554d5fe

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Documented how "expires epoch" affects Cache-Control.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 25 Dec 2018 13:27:16 +0300
parents d2969b2f69ae
children 375a3dfde23b
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2310:0b582fc34ddc 2311:6ca49554d5fe
8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> 8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
9 9
10 <module name="Module ngx_http_headers_module" 10 <module name="Module ngx_http_headers_module"
11 link="/en/docs/http/ngx_http_headers_module.html" 11 link="/en/docs/http/ngx_http_headers_module.html"
12 lang="en" 12 lang="en"
13 rev="10"> 13 rev="11">
14 14
15 <section id="summary"> 15 <section id="summary">
16 16
17 <para> 17 <para>
18 The <literal>ngx_http_headers_module</literal> module allows adding 18 The <literal>ngx_http_headers_module</literal> module allows adding
145 expires @15h30m; 145 expires @15h30m;
146 </example> 146 </example>
147 </para> 147 </para>
148 148
149 <para> 149 <para>
150 The <literal>epoch</literal> parameter corresponds to the absolute time
151 “<literal>Thu, 01 Jan 1970 00:00:01 GMT</literal>”.
152 The contents of the <header>Cache-Control</header> field depends 150 The contents of the <header>Cache-Control</header> field depends
153 on the sign of the specified time: 151 on the sign of the specified time:
154 <list type="bullet"> 152 <list type="bullet">
155 153
156 <listitem> 154 <listitem>
162 <header>Cache-Control: max-age=<value>t</value></header>, 160 <header>Cache-Control: max-age=<value>t</value></header>,
163 where <value>t</value> is a time specified in the directive, in seconds. 161 where <value>t</value> is a time specified in the directive, in seconds.
164 </listitem> 162 </listitem>
165 163
166 </list> 164 </list>
165 </para>
166
167 <para>
168 The <literal>epoch</literal> parameter sets <header>Expires</header>
169 to the value “<literal>Thu, 01 Jan 1970 00:00:01 GMT</literal>”,
170 and <header>Cache-Control</header> to “<literal>no-cache</literal>”.
167 </para> 171 </para>
168 172
169 <para> 173 <para>
170 The <literal>max</literal> parameter sets <header>Expires</header> 174 The <literal>max</literal> parameter sets <header>Expires</header>
171 to the value “<literal>Thu, 31 Dec 2037 23:55:55 GMT</literal>”, 175 to the value “<literal>Thu, 31 Dec 2037 23:55:55 GMT</literal>”,