Mercurial > hg > nginx-site
view xml/en/docs/stream/stream_processing.xml @ 2846:fdf1464e1977
Moved banner to the external file to make partial rollout possible.
An idea is to have several banners and show them with different probability
specified by split directive in the nginx.conf
author | Sergey Budnevitch <sb@waeme.net> |
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date | Tue, 10 May 2022 18:07:27 +0400 |
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>