Fixed #19101 -- Decoding of non-ASCII POST data on Python 3.

Thanks Claude Paroz.

tests/regressiontests/requests/tests.py

@@ -12,7 +12,7 @@ from django.http import HttpRequest, HttpResponse, parse_cookie, build_request_r
 from django.test.client import FakePayload
 from django.test.utils import override_settings, str_prefix
 from django.utils import unittest
-from django.utils.http import cookie_date
+from django.utils.http import cookie_date, urlencode
 from django.utils.timezone import utc
 
 
@@ -353,6 +353,16 @@ class RequestsTests(unittest.TestCase):
         self.assertRaises(Exception, lambda: request.body)
         self.assertEqual(request.POST, {})
 
+    def test_non_ascii_POST(self):
+        payload = FakePayload(urlencode({'key': 'España'}))
+        request = WSGIRequest({
+            'REQUEST_METHOD': 'POST',
+            'CONTENT_LENGTH': len(payload),
+            'CONTENT_TYPE': 'application/x-www-form-urlencoded',
+            'wsgi.input': payload,
+        })
+        self.assertEqual(request.POST, {'key': ['España']})
+
     def test_alternate_charset_POST(self):
         """
         Test a POST with non-utf-8 payload encoding.