fix: flush only active buffers in response stream (#57952)

vaishnavyogesh · web-flow · commit aa758b0a6e88 · 2025-11-27T10:33:58.000-06:00
diff --git a/src/Illuminate/Routing/ResponseFactory.php b/src/Illuminate/Routing/ResponseFactory.php
@@ -203,7 +203,7 @@ public function stream($callback, $status = 200, array $headers = [])
             return new StreamedResponse(function () use ($callback) {
                 foreach ($callback() as $chunk) {
                     echo $chunk;
-                    ob_flush();
+                    when(ob_get_level() > 0, fn () => ob_flush());
                     flush();
                 }
             }, $status, array_merge($headers, ['X-Accel-Buffering' => 'no']));

Original file line number	Diff line number	Diff line change
`@@ -203,7 +203,7 @@ public function stream($callback, $status = 200, array $headers = [])`
`203`	`203`	`return new StreamedResponse(function () use ($callback) {`
`204`	`204`	`foreach ($callback() as $chunk) {`
`205`	`205`	`echo $chunk;`
`206`		`- ob_flush();`
	`206`	`+ when(ob_get_level() > 0, fn () => ob_flush());`
`207`	`207`	`flush();`
`208`	`208`	`}`
`209`	`209`	`}, $status, array_merge($headers, ['X-Accel-Buffering' => 'no']));`