Fixed django#16916 -- Documented default headers for the test client.

Thanks sailorfred AT yahoo.com for the report and raulcd
for the initial version of the patch.

AUTHORS

@@ -136,9 +136,10 @@ answer newbie questions, and generally made Django that much better:
     Robert Coup
     Pete Crosier <pete.crosier@gmail.com>
     Matt Croydon <http://www.postneo.com/>
+    Jure Cuhalev <gandalf@owca.info>
     Leah Culver <leah.culver@gmail.com>
+    Raúl Cumplido <raulcumplido@gmail.com>
     flavio.curella@gmail.com
-    Jure Cuhalev <gandalf@owca.info>
     John D'Agostino <john.dagostino@gmail.com>
     dackze+django@gmail.com
     Jim Dalton <jim.dalton@gmail.com>

docs/topics/testing.txt

@@ -650,8 +650,6 @@ Note a few important things about how the test client works:
 * By default, the test client will disable any CSRF checks
   performed by your site.
 
-  .. versionadded:: 1.2.2
-
   If, for some reason, you *want* the test client to perform CSRF
   checks, you can create an instance of the test client that
   enforces CSRF checks. To do this, pass in the
@@ -664,10 +662,23 @@ Note a few important things about how the test client works:
 Making requests
 ~~~~~~~~~~~~~~~
 
-Use the ``django.test.client.Client`` class to make requests. It requires no
-arguments at time of construction:
+Use the ``django.test.client.Client`` class to make requests.
+
+.. class:: Client(enforce_csrf_checks=False, **defaults)
+
+    It requires no arguments at time of construction. However, you can use
+    keywords arguments to specify some default headers. For example, this will
+    send a ``User-Agent`` HTTP header in each request::
+
+        >>> c = Client(HTTP_USER_AGENT='Mozilla/5.0')
+
+    The values from the ``extra`` keywords arguments passed to
+    :meth:`~django.test.client.Client.get()`,
+    :meth:`~django.test.client.Client.post()`, etc. have precedence over
+    the defaults passed to the class constructor.
 
-.. class:: Client()
+    The ``enforce_csrf_checks`` argument can be used to test CSRF
+    protection (see above).
 
     Once you have a ``Client`` instance, you can call any of the following
     methods: