nginx.conf

events {}
http {
    include       mime.types;
    default_type  application/octet-stream;

    server {
        listen 8080;
        location / {
            rewrite ^/$ /swagger/? permanent;
            proxy_pass http://127.0.0.1:1317;

            if ($request_method = 'OPTIONS') {
                add_header 'Access-Control-Allow-Origin' $http_origin;
                add_header 'Access-Control-Allow-Credentials' 'true';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,baggage,sentry-trace';
                add_header 'Content-Length' '0';
                add_header 'Content-Type' 'text/plain charset=UTF-8';
                return 204;
            }

            add_header 'Access-Control-Allow-Origin' $http_origin;
            add_header 'Access-Control-Allow-Credentials' 'true';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,baggage,sentry-trace';
        }
    }

    server {
        listen 8081;
        location / {
            proxy_pass http://127.0.0.1:26657;

            if ($request_method = 'OPTIONS') {
                add_header 'Access-Control-Allow-Origin' $http_origin;
                add_header 'Access-Control-Allow-Credentials' 'true';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,baggage,sentry-trace';
                add_header 'Content-Length' '0';
                add_header 'Content-Type' 'text/plain charset=UTF-8';
                return 204;
            }

            add_header 'Access-Control-Allow-Origin' $http_origin;
            add_header 'Access-Control-Allow-Credentials' 'true';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,baggage,sentry-trace';
        }
    }
}