Mercurial > hg > nginx-site
view xml/en/docs/http/ngx_http_slice_module.xml @ 2223:a692df6ef304
Added upstream keepalive_timeout and keepalive_requests.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 22 Aug 2018 12:44:26 +0300 |
parents | 6299f9cabfe4 |
children | 4add6ae1296f |
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<?xml version="1.0"?> <!-- Copyright (C) Nginx, Inc. --> <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> <module name="Module ngx_http_slice_module" link="/en/docs/http/ngx_http_slice_module.html" lang="en" rev="3"> <section id="summary"> <para> The <literal>ngx_http_slice_module</literal> module (1.9.8) is a filter that splits a request into subrequests, each returning a certain range of response. The filter provides more effective caching of big responses. </para> <para> This module is not built by default, it should be enabled with the <literal>--with-http_slice_module</literal> configuration parameter. </para> </section> <section id="example" name="Example Configuration"> <para> <example> location / { <emphasis>slice</emphasis> 1m; proxy_cache cache; proxy_cache_key $uri$is_args$args<emphasis>$slice_range</emphasis>; proxy_set_header Range <emphasis>$slice_range</emphasis>; proxy_cache_valid 200 206 1h; proxy_pass http://localhost:8000; } </example> In this example, the response is split into 1-megabyte cacheable slices. </para> </section> <section id="directives" name="Directives"> <directive name="slice"> <syntax><value>size</value></syntax> <default>0</default> <context>http</context> <context>server</context> <context>location</context> <para> Sets the <value>size</value> of the slice. The zero value disables splitting responses into slices. Note that a too low value may result in excessive memory usage and opening a large number of files. </para> <para> In order for a subrequest to return the required range, the <var>$slice_range</var> variable should be <link doc="ngx_http_proxy_module.xml" id="proxy_set_header">passed</link> to the proxied server as the <literal>Range</literal> request header field. If <link doc="ngx_http_proxy_module.xml" id="proxy_cache">caching</link> is enabled, <var>$slice_range</var> should be added to the <link doc="ngx_http_proxy_module.xml" id="proxy_cache_key">cache key</link> and caching of responses with 206 status code should be <link doc="ngx_http_proxy_module.xml" id="proxy_cache_valid">enabled</link>. </para> </directive> </section> <section id="variables" name="Embedded Variables"> <para> The <literal>ngx_http_slice_module</literal> module supports the following embedded variables: <list type="tag"> <tag-name id="var_slice_range"><var>$slice_range</var></tag-name> <tag-desc> the current slice range in <link url="https://tools.ietf.org/html/rfc7233#section-2.1">HTTP byte range</link> format, for example, <literal>bytes=0-1048575</literal>. </tag-desc> </list> </para> </section> </module>