fix: postpone initialize

Author: alexander-akait

lib/Server.js

@@ -40,12 +40,14 @@ class Server {
     this.webSocketHeartbeatInterval = 30000;
 
     normalizeOptions(
-      this.compiler,
-      this.options,
-      this.logger,
-      Server.findCacheDir()
+        this.compiler,
+        this.options,
+        this.logger,
+        Server.findCacheDir()
     );
+  }
 
+  initialize() {
     this.applyDevServerPlugin();
 
     this.webSocketServerImplementation = getSocketServerImplementation(
@@ -924,6 +926,8 @@ class Server {
       .then((foundPort) => {
         this.options.port = foundPort;
 
+        this.initialize();
+
         return this.server.listen(
           this.options.port,
           this.options.host,