Upstream: trailers support, u->conf->pass_trailers flag. Basic trailer headers support allows one to access response trailers via the $upstream_trailer_* variables. Additionally, the u->conf->pass_trailers flag was introduced. When the flag is set, trailer headers from the upstream response are passed to the client. Like normal headers, trailer headers will be hidden if present in u->conf->hide_headers_hash.

/*
 * Copyright (C) Ruslan Ermilov
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_RWLOCK_H_INCLUDED_
#define _NGX_RWLOCK_H_INCLUDED_


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


void ngx_rwlock_wlock(ngx_atomic_t *lock);
void ngx_rwlock_rlock(ngx_atomic_t *lock);
void ngx_rwlock_unlock(ngx_atomic_t *lock);
void ngx_rwlock_downgrade(ngx_atomic_t *lock);


#endif /* _NGX_RWLOCK_H_INCLUDED_ */