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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 d620f497c50f
children
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_MAIL_SMTP_MODULE_H_INCLUDED_
#define _NGX_MAIL_SMTP_MODULE_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_mail.h>
#include <ngx_mail_smtp_module.h>


typedef struct {
    ngx_msec_t   greeting_delay;

    size_t       client_buffer_size;

    ngx_str_t    capability;
    ngx_str_t    starttls_capability;
    ngx_str_t    starttls_only_capability;

    ngx_str_t    server_name;
    ngx_str_t    greeting;

    ngx_uint_t   auth_methods;

    ngx_array_t  capabilities;
} ngx_mail_smtp_srv_conf_t;


void ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c);
void ngx_mail_smtp_init_protocol(ngx_event_t *rev);
void ngx_mail_smtp_auth_state(ngx_event_t *rev);
ngx_int_t ngx_mail_smtp_parse_command(ngx_mail_session_t *s);


extern ngx_module_t  ngx_mail_smtp_module;


#endif /* _NGX_MAIL_SMTP_MODULE_H_INCLUDED_ */