Patch to enable Accept headers in Internet Explorer when an Ajax Library on the…

Patch to enable Accept headers in Internet Explorer when an Ajax Library on the client (i.e. jQuery) is sending an XMLHttpRequest

djangorestframework/mixins.py

@@ -274,7 +274,8 @@ class ResponseMixin(object):
             accept_list = [request.GET.get(self._ACCEPT_QUERY_PARAM)]
         elif (self._IGNORE_IE_ACCEPT_HEADER and
               'HTTP_USER_AGENT' in request.META and
-              MSIE_USER_AGENT_REGEX.match(request.META['HTTP_USER_AGENT'])):
+              MSIE_USER_AGENT_REGEX.match(request.META['HTTP_USER_AGENT']) and
+              request.META.get('HTTP_X_REQUESTED_WITH', '') != 'XMLHttpRequest'):
             # Ignore MSIE's broken accept behavior and do something sensible instead
             accept_list = ['text/html', '*/*']
         elif 'HTTP_ACCEPT' in request.META:

djangorestframework/tests/accept.py

@@ -50,6 +50,16 @@ class UserAgentMungingTest(TestCase):
             resp = self.view(req)
             self.assertEqual(resp['Content-Type'], 'text/html')
 
+    def test_dont_munge_msie_with_x_requested_with_header(self):
+        """Send MSIE user agent strings, and an X-Requested-With header, and
+        ensure that we get a JSON response if we set a */* Accept header."""
+        for user_agent in (MSIE_9_USER_AGENT,
+                           MSIE_8_USER_AGENT,
+                           MSIE_7_USER_AGENT):
+            req = self.req.get('/', HTTP_ACCEPT='*/*', HTTP_USER_AGENT=user_agent, HTTP_X_REQUESTED_WITH='XMLHttpRequest')
+            resp = self.view(req)
+            self.assertEqual(resp['Content-Type'], 'application/json')
+
     def test_dont_rewrite_msie_accept_header(self):
         """Turn off _IGNORE_IE_ACCEPT_HEADER, send MSIE user agent strings and ensure
         that we get a JSON response if we set a */* accept header."""