fixed nginx conf because socket.io docs are broken 🙂

nginx.conf

@@ -16,13 +16,15 @@ server {
         proxy_set_header X-Forwarded-Proto $scheme;
     }
 
-    location /socket.io/ {
+    location ~* \.io {
+      proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-      proxy_set_header Host $host;
-
-      proxy_pass http://localhost:3000;
-
+      proxy_set_header Host $http_host;
+      proxy_set_header X-NginX-Proxy false;
+      proxy_pass http://relay-server:3000;
+      proxy_redirect off;
       proxy_http_version 1.1;
       proxy_set_header Upgrade $http_upgrade;
       proxy_set_header Connection "upgrade";
-    }}
+    }
+}