minor #14237 Update http_client.rst (ThomasLandauer)

OskarStark · OskarStark · commit 22312d35c560 · 2020-10-30T13:41:51.000+01:00
This PR was merged into the 4.4 branch. Discussion ---------- Update http_client.rst Integrating the findings of symfony/symfony#38082 (comment) Commits ------- c8e5dd6 Update http_client.rst
diff --git a/http_client.rst b/http_client.rst
@@ -637,6 +637,11 @@ when the streams are large)::
         'body' => $formData->bodyToString(),
     ]);
 
+If you need to add a custom HTTP header to the upload, you can do::
+
+    $headers = $formData->getPreparedHeaders()->toArray();
+    $headers[] = 'X-Foo: bar';
+
 Cookies
 ~~~~~~~
 
