Limit req: "delay=" parameter. This parameter specifies an additional "soft" burst limit at which requests become delayed (but not yet rejected as it happens if "burst=" limit is exceeded). Defaults to 0, i.e., all excess requests are delayed. Originally inspired by Vladislav Shabanov (http://mailman.nginx.org/pipermail/nginx-devel/2016-April/008126.html). Further improved based on a patch by Peter Shchuchkin (http://mailman.nginx.org/pipermail/nginx-devel/2018-October/011522.html).

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


#ifndef _NGX_MD5_H_INCLUDED_
#define _NGX_MD5_H_INCLUDED_


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


typedef struct {
    uint64_t  bytes;
    uint32_t  a, b, c, d;
    u_char    buffer[64];
} ngx_md5_t;


void ngx_md5_init(ngx_md5_t *ctx);
void ngx_md5_update(ngx_md5_t *ctx, const void *data, size_t size);
void ngx_md5_final(u_char result[16], ngx_md5_t *ctx);


#endif /* _NGX_MD5_H_INCLUDED_ */