Mercurial > hg > nginx-site

comparison xml/en/docs/http/ngx_http_scgi_module.xml @ 1910:41cf2c2d8c5c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Cache: support for stale-while-revalidate and stale-if-error.
author Yaroslav Zhuravlev <yar@nginx.com>
date Wed, 15 Feb 2017 23:17:00 +0300
parents 399d0e188195
children ec4af97e4403
comparison
equal deleted inserted replaced
1909:399d0e188195 1910:41cf2c2d8c5c
8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> 8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
9 9
10 <module name="Module ngx_http_scgi_module" 10 <module name="Module ngx_http_scgi_module"
11 link="/en/docs/http/ngx_http_scgi_module.html" 11 link="/en/docs/http/ngx_http_scgi_module.html"
12 lang="en" 12 lang="en"
13 rev="30"> 13 rev="31">
14 14
15 <section id="summary"> 15 <section id="summary">
16 16
17 <para> 17 <para>
18 The <literal>ngx_http_scgi_module</literal> module allows passing 18 The <literal>ngx_http_scgi_module</literal> module allows passing
620 620
621 <para> 621 <para>
622 The <literal>error</literal> parameter also permits 622 The <literal>error</literal> parameter also permits
623 using a stale cached response if an SCGI server to process a request 623 using a stale cached response if an SCGI server to process a request
624 cannot be selected. 624 cannot be selected.
625 The same behavior can be enabled with the
626 “<link url="https://tools.ietf.org/html/rfc5861#section-4">stale-if-error</link>”
627 extension of the <header>Cache-Control</header> response header field (1.11.10)
628 for a specified number of seconds after the response became stale,
629 however, this has lower priority than using the directive parameter.
625 </para> 630 </para>
626 631
627 <para id="scgi_cache_use_stale_updating"> 632 <para id="scgi_cache_use_stale_updating">
628 Additionally, the <literal>updating</literal> parameter permits 633 Additionally, the <literal>updating</literal> parameter permits
629 using a stale cached response if it is currently being updated. 634 using a stale cached response if it is currently being updated.
630 This allows minimizing the number of accesses to SCGI servers 635 This allows minimizing the number of accesses to SCGI servers
631 when updating cached data. 636 when updating cached data.
637 The same behavior can be enabled with the
638 “<link url="https://tools.ietf.org/html/rfc5861#section-3">stale-while-revalidate</link>”
639 extension of the <header>Cache-Control</header> response header field (1.11.10)
640 for a specified number of seconds after the response became stale,
641 however, this has lower priority than using the directive parameter.
632 </para> 642 </para>
633 643
634 <para> 644 <para>
635 To minimize the number of accesses to SCGI servers when 645 To minimize the number of accesses to SCGI servers when
636 populating a new cache element, the <link id="scgi_cache_lock"/> 646 populating a new cache element, the <link id="scgi_cache_lock"/>