超时重试思考-非幂等请求

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``` upstream www.paraller.com { server 10.29.209.14:3810; server 10.24.225.11:3810; server 10.25.208.38*:3810; }

server { server_name www.paraller.com; listen 80 ; access_log /var/log/nginx/access.log vhost; return 301 https://$host$request_uri; }

server { server_name www.paraller.com; listen 443 ssl http2 ; access_log /var/log/nginx/access.log vhost;

    add_header Strict-Transport-Security "max-age=31536000";
    location ^~ /socket.io/ {
    return 301;
}
location / {
            proxy_pass http://www.paraller.com;
            proxy_connect_timeout 20;
            proxy_read_timeout 20;
            proxy_send_timeout 20;
            proxy_ignore_client_abort on;
    }

} ```

• proxy_connect_timeout 后端服务器连接的超时时间_发起握手等候响应超时时间
• proxy_read_timeout 连接成功后_等候后端服务器响应时间_其实已经进入后端的排队之中等候处理（也可以说是后端服务器处理请求的时间）
• proxy_send_timeout :后端服务器数据回传时间_就是在规定时间之内后端服务器必须传完所有的数据

nginx在某个版本更新之后，对非幂等的请求不会进行重试处理。

如果要对幂等操作重试请求

In case of upstream returning 429, I'd like to have nginx retry next upstream server. Since nginx by default won't retry non-idempotent requests, how do I force nginx to retry when receiving 429? I imagine this should be the default behavior anyway, or does nginx not care about returning code and will never retry non-idempotent?

If you want nginx to retry non-idempotent requests, you can do so with "proxy_next_upstream non-idempotent;", see http://nginx.org/r/proxy_next_upstream.

http://nginx.2469901.n2.nabble.com/upstream-429-and-non-idempotent-request-td7600353.html

优先参考上面的回答，下面是 stackflow的示例：

``` upstream backends { server 192.2.0.1; server 192.2.0.2; ... }

server { ...

location / {
    proxy_pass http://backends;
    proxy_next_upstream error timeout http_404;
}

} ```

参考网站

https://stackoverflow.com/questions/12868683/nginx-proxy-next-upstream-doesnt-work https://stackoverflow.com/questions/40661246/nginx-tries-to-proxy-pass-to-upstream-name

关于该参数的详细解释 nginx proxy_next_upstream

Nginx学习总结：proxy与rewrite模块（三）