Restore support for default port numbers

Author: Tom Atkinson

lib/WebSocket.js

@@ -541,6 +541,7 @@ function initAsClient (address, protocols, options) {
 
   const isSecure = serverUrl.protocol === 'wss:' || serverUrl.protocol === 'https:';
   const key = crypto.randomBytes(16).toString('base64');
+  const port = serverUrl.port || (isSecure ? 443 : 80);
   const httpObj = isSecure ? https : http;
 
   //
@@ -559,7 +560,7 @@ function initAsClient (address, protocols, options) {
 
   const requestOptions = {
     host: serverUrl.hostname,
-    port: serverUrl.port,
+    port,
     path: '/',
     headers: {
       'Sec-WebSocket-Version': options.protocolVersion,