Revert "[11.x] Enhance eventStream to Support Custom Events and Start Message…" (#54714)

This reverts commit cc1a3e8.

Author: taylorotwell

src/Illuminate/Routing/ResponseFactory.php

@@ -124,23 +124,12 @@ public function jsonp($callback, $data = [], $status = 200, array $headers = [],
      *
      * @param  \Closure  $callback
      * @param  array  $headers
-     * @param  string  $as
-     * @param  string|null  $startStreamWith
-     * @param  string|null  $endStreamWith
+     * @param  string  $endStreamWith
      * @return \Symfony\Component\HttpFoundation\StreamedResponse
      */
-    public function eventStream(Closure $callback, array $headers = [], string $as = 'update', ?string $startStreamWith = null, ?string $endStreamWith = '</stream>')
+    public function eventStream(Closure $callback, array $headers = [], string $endStreamWith = '</stream>')
     {
-        return $this->stream(function () use ($callback, $as, $startStreamWith, $endStreamWith) {
-            if (filled($startStreamWith)) {
-                echo "event: $as\n";
-                echo 'data: '.$startStreamWith;
-                echo "\n\n";
-
-                ob_flush();
-                flush();
-            }
-
+        return $this->stream(function () use ($callback, $endStreamWith) {
             foreach ($callback() as $message) {
                 if (connection_aborted()) {
                     break;
@@ -150,22 +139,20 @@ public function eventStream(Closure $callback, array $headers = [], string $as =
                     $message = Js::encode($message);
                 }
 
-                echo "event: $as\n";
+                echo "event: update\n";
                 echo 'data: '.$message;
                 echo "\n\n";
 
                 ob_flush();
                 flush();
             }
 
-            if (filled($endStreamWith)) {
-                echo "event: $as\n";
-                echo 'data: '.$endStreamWith;
-                echo "\n\n";
+            echo "event: update\n";
+            echo 'data: '.$endStreamWith;
+            echo "\n\n";
 
-                ob_flush();
-                flush();
-            }
+            ob_flush();
+            flush();
         }, 200, array_merge($headers, [
             'Content-Type' => 'text/event-stream',
             'Cache-Control' => 'no-cache',