[HttpClient] Mention extra.trace_content option

Author: Mathieu Lechat

http_client.rst

@@ -779,6 +779,22 @@ Alternatively, you can also disable ``verify_host`` and ``verify_peer`` (see
 :ref:`http_client config reference <reference-http-client>`), but this is not
 recommended in production.
 
+Profiling
+~~~~~~~~~
+
+When you are using the :class:`Symfony\\Component\\HttpClient\\TraceableHttpClient`
+responses content will be kept in memory, which can cause different issues.
+
+You can disable this behavior by setting the ``extra.trace_content`` to ``false``
+in your requests’ options::
+
+    $response = $client->request('GET', 'https://...', [
+        'extra' => ['trace_content' => false],
+    ]);
+
+This setting won’t have any effect with other clients.
+
+
 Performance
 -----------
 
@@ -1273,7 +1289,7 @@ Symfony's HTTP client provides an EventSource implementation to consume these
 server-sent events. Use the :class:`Symfony\\Component\\HttpClient\\EventSourceHttpClient`
 to wrap your HTTP client, open a connection to a server that responds with a
 ``text/event-stream`` content type and consume the stream as follows::
-    
+
     use Symfony\Component\HttpClient\Chunk\ServerSentEvent;
     use Symfony\Component\HttpClient\EventSourceHttpClient;