nginx.conf

worker_processes  auto;
error_log  logs/error.log  debug;
pid     /run/nginx.pid;
events {
    worker_connections  1024;
}

http {

    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    tcp_nopush     on;

    keepalive_timeout  120;
    client_max_body_size 0;
    gzip  on;

    upstream cartodb_sql{
        server  127.0.0.1:8080;
    }

    upstream cartodb_main{
        server 127.0.0.1:5000;
    }

    upstream cartodb_tiler{
        server 127.0.0.1:8181;
    }

    server {

        listen                80;


        location  /api/v2/sql {
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            proxy_set_header X-NginX-Proxy true;
            proxy_redirect off;
            proxy_pass http://cartodb_sql;
            break;
        }

        location  /api/v1/sql {
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            proxy_set_header X-NginX-Proxy true;
            proxy_redirect off;
            proxy_pass http://cartodb_sql;
            break;
        }

        location ~* ^/assets/ {
            add_header Cache-Control public;
            root    /home/user/cartodb20/public;
        }

        location  /api/v1/map {
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            proxy_set_header X-NginX-Proxy true;
            proxy_redirect off;
            if ($is_args != "") {
                add_header X-debug-message "$is_args";
                proxy_pass http://cartodb_tiler;
            }
            if ($is_args = "") {
                add_header X-debug-message "$is_args";
                proxy_pass http://cartodb_main;
            }

        }



        location / {

            if ($http_origin) {
                add_header Access-Control-Allow-Origin *;
                add_header Access-Control-Allow-Methods "GET,POST,OPTIONS,PUT";
                add_header         Access-Control-Allow-Headers   Content-Type;
                add_header         Access-Control-Max-Age         86400;
            }
            if ($request_method = OPTIONS ) {
                add_header Content-Length 0;
                add_header Content-Type text/plain;
                return 200;
            }
            proxy_redirect     off;
            proxy_set_header   X-Real-IP        $remote_addr;
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            proxy_set_header X-NginX-Proxy true;
            proxy_pass http://cartodb_main;
        }
    }

}