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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 8b84d60ef13d
children
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_PROCESS_H_INCLUDED_
#define _NGX_PROCESS_H_INCLUDED_


typedef DWORD               ngx_pid_t;
#define NGX_INVALID_PID     0


#define ngx_getpid          GetCurrentProcessId
#define ngx_getppid()       0
#define ngx_log_pid         ngx_pid


#define NGX_PROCESS_SYNC_NAME                                                 \
    (sizeof("ngx_cache_manager_mutex_") + NGX_INT32_LEN)


typedef uint64_t            ngx_cpuset_t;


typedef struct {
    HANDLE                  handle;
    ngx_pid_t               pid;
    char                   *name;

    HANDLE                  term;
    HANDLE                  quit;
    HANDLE                  reopen;

    u_char                  term_event[NGX_PROCESS_SYNC_NAME];
    u_char                  quit_event[NGX_PROCESS_SYNC_NAME];
    u_char                  reopen_event[NGX_PROCESS_SYNC_NAME];

    unsigned                just_spawn:1;
    unsigned                exiting:1;
} ngx_process_t;


typedef struct {
    char                   *path;
    char                   *name;
    char                   *args;
    char *const            *argv;
    char *const            *envp;
    HANDLE                  child;
} ngx_exec_ctx_t;


ngx_pid_t ngx_spawn_process(ngx_cycle_t *cycle, char *name, ngx_int_t respawn);
ngx_pid_t ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx);

#define ngx_debug_point()
#define ngx_sched_yield()   SwitchToThread()


#define NGX_MAX_PROCESSES         (MAXIMUM_WAIT_OBJECTS - 4)

#define NGX_PROCESS_RESPAWN       -2
#define NGX_PROCESS_JUST_RESPAWN  -3


extern int                  ngx_argc;
extern char               **ngx_argv;
extern char               **ngx_os_argv;

extern ngx_int_t            ngx_last_process;
extern ngx_process_t        ngx_processes[NGX_MAX_PROCESSES];

extern ngx_pid_t            ngx_pid;
extern ngx_pid_t            ngx_parent;


#endif /* _NGX_PROCESS_H_INCLUDED_ */