Mercurial > hg > nginx-quic
annotate src/mail/ngx_mail_smtp_module.h @ 9022:cffaf3f2eec8
Lingering close for connections with pipelined requests.
This is expected to help with clients using pipelining with some constant
depth, such as apt[1][2].
When downloading many resources, apt uses pipelining with some constant
depth, a number of requests in flight. This essentially means that after
receiving a response it sends an additional request to the server, and
this can result in requests arriving to the server at any time. Further,
additional requests are sent one-by-one, and can be easily seen as such
(neither as pipelined, nor followed by pipelined requests).
The only safe approach to close such connections (for example, when
keepalive_requests is reached) is with lingering. To do so, now nginx
monitors if pipelining was used on the connection, and if it was, closes
the connection with lingering.
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=973861#10
[2] https://mailman.nginx.org/pipermail/nginx-devel/2023-January/ZA2SP5SJU55LHEBCJMFDB2AZVELRLTHI.html
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Thu, 02 Feb 2023 23:38:48 +0300 |
parents | d620f497c50f |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #ifndef _NGX_MAIL_SMTP_MODULE_H_INCLUDED_ |
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9 #define _NGX_MAIL_SMTP_MODULE_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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14 #include <ngx_mail.h> |
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15 #include <ngx_mail_smtp_module.h> |
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18 typedef struct { |
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19 ngx_msec_t greeting_delay; |
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21 size_t client_buffer_size; |
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23 ngx_str_t capability; |
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24 ngx_str_t starttls_capability; |
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25 ngx_str_t starttls_only_capability; |
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27 ngx_str_t server_name; |
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28 ngx_str_t greeting; |
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30 ngx_uint_t auth_methods; |
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32 ngx_array_t capabilities; |
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33 } ngx_mail_smtp_srv_conf_t; |
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36 void ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c); |
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37 void ngx_mail_smtp_init_protocol(ngx_event_t *rev); |
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38 void ngx_mail_smtp_auth_state(ngx_event_t *rev); |
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39 ngx_int_t ngx_mail_smtp_parse_command(ngx_mail_session_t *s); |
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42 extern ngx_module_t ngx_mail_smtp_module; |
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45 #endif /* _NGX_MAIL_SMTP_MODULE_H_INCLUDED_ */ |