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view xml/en/docs/stream/stream_processing.xml @ 2717:ff8eeb6ac833
Updated with Netcraft April 2021 Web Server Survey stats.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 04 May 2021 20:47:31 +0100 |
parents | 2fd28cd4f2f8 |
children | 4959250ba429 |
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<!-- Copyright (C) Nginx, Inc. --> <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd"> <article name="How nginx processes a TCP/UDP session" link="/en/docs/stream/stream_processing.html" lang="en" rev="3"> <section> <para> A TCP/UDP session from a client is processed in successive steps called <b>phases</b>: <list type="tag"> <tag-name id="postaccept_phase"> <literal>Post-accept</literal> </tag-name> <tag-desc> The first phase after accepting a client connection. The <link doc="ngx_stream_realip_module.xml">ngx_stream_realip_module</link> module is invoked at this phase. </tag-desc> <tag-name id="preaccess_phase"> <literal>Pre-access</literal> </tag-name> <tag-desc> Preliminary check for access. The <link doc="ngx_stream_limit_conn_module.xml">ngx_stream_limit_conn_module</link> and <link doc="ngx_stream_set_module.xml">ngx_stream_set_module</link> modules are invoked at this phase. </tag-desc> <tag-name id="access_phase"> <literal>Access</literal> </tag-name> <tag-desc> Client access limitation before actual data processing. The <link doc="ngx_stream_access_module.xml">ngx_stream_access_module</link> module is invoked at this phase. </tag-desc> <tag-name id="ssl_phase"> <literal>SSL</literal> </tag-name> <tag-desc> TLS/SSL termination. The <link doc="ngx_stream_ssl_module.xml">ngx_stream_ssl_module</link> module is invoked at this phase. </tag-desc> <tag-name id="preread_phase"> <literal>Preread</literal> </tag-name> <tag-desc> Reading initial bytes of data into the <link doc="ngx_stream_core_module.xml" id="preread_buffer_size">preread buffer</link> to allow modules such as <link doc="ngx_stream_ssl_preread_module.xml">ngx_stream_ssl_preread_module</link> analyze the data before its processing. </tag-desc> <tag-name id="content_phase"> <literal>Content</literal> </tag-name> <tag-desc> Mandatory phase where data is actually processed, usually <link doc="ngx_stream_proxy_module.xml">proxied</link> to <link doc="ngx_stream_upstream_module.xml">upstream</link> servers, or a specified value is <link doc="ngx_stream_return_module.xml">returned</link> to a client. </tag-desc> <tag-name id="log_phase"> <literal>Log</literal> </tag-name> <tag-desc> The final phase where the result of a client session processing is recorded. The <link doc="ngx_stream_log_module.xml">ngx_stream_log_module</link> module is invoked at this phase. </tag-desc> </list> </para> </section> </article>