Mercurial > hg > nginx-site
comparison xml/en/docs/stream/stream_processing.xml @ 1797:be868c8f6e9c
Added article about processing TCP/UDP sessions.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 21 Sep 2016 15:35:35 +0300 |
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children | 59d1f512c3a0 |
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1796:1d576e8d6ead | 1797:be868c8f6e9c |
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1 <!-- | |
2 Copyright (C) Nginx, Inc. | |
3 --> | |
4 | |
5 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd"> | |
6 | |
7 <article name="How nginx processes a TCP/UDP session" | |
8 link="/en/docs/stream/stream_processing.html" | |
9 lang="en" | |
10 rev="1"> | |
11 | |
12 <section> | |
13 | |
14 <para> | |
15 A TCP/UDP session from a client is processed | |
16 in successive steps called <b>phases</b>: | |
17 | |
18 <list type="tag"> | |
19 | |
20 <tag-name id="postaccept_phase"> | |
21 <literal>Post-accept</literal> | |
22 </tag-name> | |
23 <tag-desc> | |
24 The first phase after accepting a client connection. | |
25 The <link doc="ngx_stream_realip_module.xml">ngx_stream_realip_module</link> | |
26 module is invoked at this phase. | |
27 </tag-desc> | |
28 | |
29 <tag-name id="preaccess_phase"> | |
30 <literal>Pre-access</literal> | |
31 </tag-name> | |
32 <tag-desc> | |
33 Preliminary check for access. | |
34 The <link doc="ngx_stream_limit_conn_module.xml">ngx_stream_limit_conn_module</link> | |
35 module is invoked at this phase. | |
36 </tag-desc> | |
37 | |
38 <tag-name id="access_phase"> | |
39 <literal>Access</literal> | |
40 </tag-name> | |
41 <tag-desc> | |
42 Client access limitation before actual data processing. | |
43 The <link doc="ngx_stream_access_module.xml">ngx_stream_access_module</link> | |
44 module is invoked at this phase. | |
45 </tag-desc> | |
46 | |
47 <tag-name id="ssl_phase"> | |
48 <literal>SSL</literal> | |
49 </tag-name> | |
50 <tag-desc> | |
51 TLS/SSL termination. | |
52 The <link doc="ngx_stream_ssl_module.xml">ngx_stream_ssl_module</link> | |
53 module is invoked at this phase. | |
54 </tag-desc> | |
55 | |
56 <tag-name id="preread_phase"> | |
57 <literal>Preread</literal> | |
58 </tag-name> | |
59 <tag-desc> | |
60 Reading initial bytes of data into the preread buffer | |
61 to allow analyzing the data before its processing. | |
62 </tag-desc> | |
63 | |
64 <tag-name id="content_phase"> | |
65 <literal>Content</literal> | |
66 </tag-name> | |
67 <tag-desc> | |
68 Mandatory phase where data is actually processed, usually | |
69 <link doc="ngx_stream_proxy_module.xml">proxied</link> to | |
70 <link doc="ngx_stream_upstream_module.xml">upstream</link> servers, | |
71 or a specified value | |
72 is <link doc="ngx_stream_return_module.xml">returned</link> to a client. | |
73 </tag-desc> | |
74 | |
75 <tag-name id="log_phase"> | |
76 <literal>Log</literal> | |
77 </tag-name> | |
78 <tag-desc> | |
79 The final phase | |
80 where the result of a client session processing is recorded. | |
81 The <link doc="ngx_stream_log_module.xml">ngx_stream_log_module</link> | |
82 module is invoked at this phase. | |
83 </tag-desc> | |
84 </list> | |
85 | |
86 </para> | |
87 | |
88 </section> | |
89 | |
90 </article> |