worker_processes  1;

user root;  

events {

    worker_connections  1024;

}

​

http {

    include       mime.types;

    default_type  application/octet-stream;

    gzip  on;

    log_format graylog2_json escape=json '{ "timestamp": "$time_iso8601", '

                     '"remote_addr": "$remote_addr", '

                     '"body_bytes_sent": $body_bytes_sent, '

                     '"request_time": $request_time, '

                     '"response_status": $status, '

                     '"request": "$request", '

                     '"request_method": "$request_method", '

                     '"host": "$host",'

                     '"request_body":"$request_body",'

                     '"response_body":"$resp_body",'

                     '"upstream_cache_status": "$upstream_cache_status",'

                     '"upstream_addr": "$upstream_addr",'

                     '"http_x_forwarded_for": "$http_x_forwarded_for",'

                     '"http_referrer": "$http_referer", '

                     '"http_user_agent": "$http_user_agent" }';

    real_ip_header     X-Forwarded-For;

    real_ip_recursive on;

    upstream api {

       server xxxx:port weight=20;

       server xxx:port weight=10;

       server xxxx:port weight=10;

    }

    server {

        listen       80;

        charset utf-8;

        default_type text/html;

        location / {

           set $resp_body "";

           access_log  /usr/local/openresty/nginx/logs/access_test.log  graylog2_json;

           access_log syslog:server=graylog-server:12301 graylog2_json;

           body_filter_by_lua_block {

                local resp_body = string.sub(ngx.arg[1], 1, 1000)  

                ngx.ctx.buffered = string.sub((ngx.ctx.buffered or "") .. resp_body, 1, 1000)

               -- arg[2] is true if this is the last chunk

                 if ngx.arg[2] then

                  ngx.var.resp_body = ngx.ctx.buffered

                end

           }

           proxy_set_header Host $http_host;

           proxy_set_header X-Real-IP $remote_addr;

           proxy_set_header X-Forwarded-For $remote_addr;

           client_body_buffer_size 10M;

           client_max_body_size 10G;

           proxy_buffers 1024 4k;

           proxy_read_timeout 120s;

           proxy_connect_timeout 2s;

           proxy_pass http://api;

           real_ip_header     X-Forwarded-For;

           real_ip_recursive on; 

        }

        error_page   500 502 503 504  /50x.html;

        location = /50x.html {

            root   html;

        }

​

    }

}