Determine external http response size without reading stream

Author: AlexVanderbist

src/Recorders/ExternalHttpRecorder/ExternalHttpRecorder.php

@@ -6,6 +6,7 @@
 use Illuminate\Http\Client\Events\ConnectionFailed;
 use Illuminate\Http\Client\Events\RequestSending;
 use Illuminate\Http\Client\Events\ResponseReceived;
+use Illuminate\Http\Client\Response;
 use Spatie\FlareClient\Recorders\ExternalHttpRecorder\ExternalHttpRecorder as BaseExternalHttpRecorder;
 use Spatie\FlareClient\Support\BackTracer;
 use Spatie\FlareClient\Support\Redactor;
@@ -34,12 +35,28 @@ public function boot(): void
 
         $this->dispatcher->listen(ResponseReceived::class, fn (ResponseReceived $event) => $this->recordReceived(
             $event->response->status(),
-            strlen($event->response->body()),
+            $this->getResponseLength($event->response),
             $event->response->headers(),
         ));
 
         $this->dispatcher->listen(ConnectionFailed::class, fn (ConnectionFailed $event) => $this->recordConnectionFailed(
             $event->exception::class
         ));
     }
+
+    /**
+     * Determine the content length of the response without reading the stream.
+     */
+    protected function getResponseLength(Response $response): ?int
+    {
+        if ($response->getHeaderLine('Transfer-Encoding') === 'chunked') {
+            return null;
+        }
+
+        if ($response->hasHeader('Content-Length')) {
+            return (int) $response->getHeaderLine('Content-Length');
+        }
+
+        return $response->toPsrResponse()->getBody()->getSize() ?: null;
+    }
 }