Example configuration for nginx

rdiffweb.conf

    location /rdiffweb {
        rewrite ^([^\?#]*/)([^\?#\./]+)([\?#].*)?$ $1$2/$3 permanent;
        # substitute with rdiffweb url
        proxy_pass http://127.0.0.1:18080/;
		# for https
		#proxy_redirect      http://example.com https://example.com/rdiffweb;
		proxy_set_header        Host $host;
		proxy_set_header        X-Real-IP $remote_addr;
		proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header        X-Forwarded-Proto $scheme;
		proxy_set_header Accept-Encoding "";
        # rewrite internal links
        sub_filter 'href="/' 'href="/rdiffweb/';
        sub_filter 'src="/' 'src="/rdiffweb/';
        sub_filter 'action="/' 'action="/rdiffweb/';
        sub_filter "url(\'/static" "url(\'/rdiffweb/static";
        sub_filter_types "*";
        sub_filter_once off;
    }

There's a typo in the proxy_pass directive. The default address is: proxy_pass http://127.0.0.1:8080/;