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view src/core/ngx_slab.h @ 9306:e46e1ea89ccd default tip
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 | 69f9ee0342db |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_SLAB_H_INCLUDED_ #define _NGX_SLAB_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> typedef struct ngx_slab_page_s ngx_slab_page_t; struct ngx_slab_page_s { uintptr_t slab; ngx_slab_page_t *next; uintptr_t prev; }; typedef struct { ngx_uint_t total; ngx_uint_t used; ngx_uint_t reqs; ngx_uint_t fails; } ngx_slab_stat_t; typedef struct { ngx_shmtx_sh_t lock; size_t min_size; size_t min_shift; ngx_slab_page_t *pages; ngx_slab_page_t *last; ngx_slab_page_t free; ngx_slab_stat_t *stats; ngx_uint_t pfree; u_char *start; u_char *end; ngx_shmtx_t mutex; u_char *log_ctx; u_char zero; unsigned log_nomem:1; void *data; void *addr; } ngx_slab_pool_t; void ngx_slab_sizes_init(void); void ngx_slab_init(ngx_slab_pool_t *pool); void *ngx_slab_alloc(ngx_slab_pool_t *pool, size_t size); void *ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size); void *ngx_slab_calloc(ngx_slab_pool_t *pool, size_t size); void *ngx_slab_calloc_locked(ngx_slab_pool_t *pool, size_t size); void ngx_slab_free(ngx_slab_pool_t *pool, void *p); void ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p); #endif /* _NGX_SLAB_H_INCLUDED_ */