server {
        listen       80;
        server_name  localhost;

        root C:/Users/Sergey/Desktop/xxx/angular2do;

        location / {
            if ($request_method = POST) {
                proxy_pass http://localhost:3000;
            } 

            if ($request_method = GET) {
                rewrite ^.*$ /index.html last;
            }

        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        # error_page   500 502 503 504  /50x.html;
        # location = /50x.html {
        #    root   html;
        # }

    }