diff --git a/lib/http-server.js b/lib/http-server.js
index dfe4c474..d732743e 100644
--- a/lib/http-server.js
+++ b/lib/http-server.js
@@ -181,6 +181,15 @@ function HttpServer(options) {
   if (options.timeout !== undefined) {
     this.server.setTimeout(options.timeout);
   }
+
+  if (typeof options.proxy === 'string') {
+    this.server.on('upgrade', function (request, socket, head) {
+      proxy.ws(request, socket, head, {
+        target: options.proxy,
+        changeOrigin: true
+      });
+    });
+  }
 }
 
 HttpServer.prototype.listen = function () {