Mercurial > hg > nginx-quic
view src/mail/ngx_mail_ssl_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> |
---|---|
date | Thu, 02 Feb 2023 23:38:48 +0300 |
parents | 3bff3f397c05 |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_MAIL_SSL_H_INCLUDED_ #define _NGX_MAIL_SSL_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_mail.h> #define NGX_MAIL_STARTTLS_OFF 0 #define NGX_MAIL_STARTTLS_ON 1 #define NGX_MAIL_STARTTLS_ONLY 2 typedef struct { ngx_flag_t enable; ngx_flag_t prefer_server_ciphers; ngx_ssl_t ssl; ngx_uint_t starttls; ngx_uint_t listen; ngx_uint_t protocols; ngx_uint_t verify; ngx_uint_t verify_depth; ssize_t builtin_session_cache; time_t session_timeout; ngx_array_t *certificates; ngx_array_t *certificate_keys; ngx_str_t dhparam; ngx_str_t ecdh_curve; ngx_str_t client_certificate; ngx_str_t trusted_certificate; ngx_str_t crl; ngx_str_t ciphers; ngx_array_t *passwords; ngx_array_t *conf_commands; ngx_shm_zone_t *shm_zone; ngx_flag_t session_tickets; ngx_array_t *session_ticket_keys; u_char *file; ngx_uint_t line; } ngx_mail_ssl_conf_t; extern ngx_module_t ngx_mail_ssl_module; #endif /* _NGX_MAIL_SSL_H_INCLUDED_ */