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view src/core/ngx_regex.h @ 8125: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 | d07456044b61 |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_REGEX_H_INCLUDED_ #define _NGX_REGEX_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #if (NGX_PCRE2) #define PCRE2_CODE_UNIT_WIDTH 8 #include <pcre2.h> #define NGX_REGEX_NO_MATCHED PCRE2_ERROR_NOMATCH /* -1 */ typedef pcre2_code ngx_regex_t; #else #include <pcre.h> #define NGX_REGEX_NO_MATCHED PCRE_ERROR_NOMATCH /* -1 */ typedef struct { pcre *code; pcre_extra *extra; } ngx_regex_t; #endif #define NGX_REGEX_CASELESS 0x00000001 #define NGX_REGEX_MULTILINE 0x00000002 typedef struct { ngx_str_t pattern; ngx_pool_t *pool; ngx_uint_t options; ngx_regex_t *regex; int captures; int named_captures; int name_size; u_char *names; ngx_str_t err; } ngx_regex_compile_t; typedef struct { ngx_regex_t *regex; u_char *name; } ngx_regex_elt_t; void ngx_regex_init(void); ngx_int_t ngx_regex_compile(ngx_regex_compile_t *rc); ngx_int_t ngx_regex_exec(ngx_regex_t *re, ngx_str_t *s, int *captures, ngx_uint_t size); #if (NGX_PCRE2) #define ngx_regex_exec_n "pcre2_match()" #else #define ngx_regex_exec_n "pcre_exec()" #endif ngx_int_t ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log); #endif /* _NGX_REGEX_H_INCLUDED_ */