Every custom header in testing client must have HTTP prefix

Ferror · javiereguiluz · commit 8e5d9bcaaee6 · 2021-04-06T13:34:29.000+02:00
diff --git a/testing.rst b/testing.rst
@@ -1029,6 +1029,10 @@ You can also override HTTP headers on a per request basis::
         'HTTP_USER_AGENT' => 'MySuperBrowser/1.0',
     ]);
 
+.. caution::
+
+    Every custom header must have `HTTP_` prefix.
+
 .. tip::
 
     The test client is available as a service in the container in the ``test``
