Incorrect special case for "return 204" removed. The special case in question leads to replies without body in configuration like location / { error_page 404 /zero; return 404; } location /zero { return 204; } while replies with empty body are expected per protocol specs. Correct one will look like if (status == NGX_HTTP_NO_CONTENT) { rc = ngx_http_send_header(r); if (rc == NGX_ERROR || r->header_only) { return rc; } return ngx_http_send_special(r, NGX_HTTP_LAST); } though it looks like it's better to drop this special case at all.

/*
 * Copyright (C) Igor Sysoev
 */


#ifndef _NGX_USER_H_INCLUDED_
#define _NGX_USER_H_INCLUDED_


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


/* STUB */
#define ngx_uid_t  ngx_int_t
#define ngx_gid_t  ngx_int_t


ngx_int_t ngx_libc_crypt(ngx_pool_t *pool, u_char *key, u_char *salt,
    u_char **encrypted);


#endif /* _NGX_USER_H_INCLUDED_ */