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Upstream: $upstream_cache_age variable. The variable reflects response age, including the time spent in the cache and the upstream response age as obtained from the "Age" header. If the response wasn't cached, the variable reflects the "Age" header of the upstream response. If the intended use case is to cache responses as per HTTP/1.1 caching model, the $upstream_cache_age variable can be used to provide the "Age" header with the "add_header" directive, such as: add_header Age $upstream_cache_age; This now removes the "Age" header if it was present. Further, the "expires" directives now removes the "Age" header if it was present in the response, as the "expires" directive assumes zero age when it adds "Expires" and "Cache-Control" headers.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 18 Jul 2024 19:39:45 +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_ */