nginx 反向代理重试机制

    upstream tomcatserver1 {  
        server 192.168.1.9:8081 weight=2;  
        server 192.168.1.29:8081 weight=2;  
    }
    server {
        listen       8082;
        listen       192.168.1.29:8082;
        server_name  192.168.1.29;
 
 
        location / {
            proxy_pass http://tomcatserver1;
            index  index.html index.htm;
            proxy_next_upstream error timeout http_503 non_idempotent; //当后端服务器超时或者返回http响应码为503时，重试当前请求，把请求发向下一个后端服务器来重试，non_idempotent 参数会强制重试，即使HTTP method是Post、Patch等非幂等方法
            proxy_connect_timeout 20s;
            proxy_read_timeout 20s;
            proxy_send_timeout 20s;
            
            #开启gzip压缩，降低传输流量
            gzip  on;
            gzip_min_length    1k;
            gzip_buffers    4 16k;
            gzip_http_version  1.1;
            gzip_comp_level  2;
            gzip_types  text/plain application/x-javascript text/css  application/xml  application/json  image/jpeg image/gif image/png;
            gzip_vary on;
            
            
        }
        
    }