Fixed #27606 -- Fixed HttpResponseRedirect.__repr__() crash when DisallowedRedirect is raised.

django/http/response.py

@@ -420,11 +420,11 @@ class HttpResponseRedirectBase(HttpResponse):
     allowed_schemes = ['http', 'https', 'ftp']
 
     def __init__(self, redirect_to, *args, **kwargs):
+        super(HttpResponseRedirectBase, self).__init__(*args, **kwargs)
+        self['Location'] = iri_to_uri(redirect_to)
         parsed = urlparse(force_text(redirect_to))
         if parsed.scheme and parsed.scheme not in self.allowed_schemes:
             raise DisallowedRedirect("Unsafe redirect to URL with protocol '%s'" % parsed.scheme)
-        super(HttpResponseRedirectBase, self).__init__(*args, **kwargs)
-        self['Location'] = iri_to_uri(redirect_to)
 
     url = property(lambda self: self['Location'])
 

tests/httpwrappers/tests.py

@@ -8,7 +8,7 @@ import pickle
 import unittest
 import uuid
 
-from django.core.exceptions import SuspiciousOperation
+from django.core.exceptions import DisallowedRedirect, SuspiciousOperation
 from django.core.serializers.json import DjangoJSONEncoder
 from django.core.signals import request_finished
 from django.db import close_old_connections
@@ -517,6 +517,17 @@ class HttpResponseSubclassesTests(SimpleTestCase):
         expected = '<HttpResponseRedirect status_code=302, "text/html; charset=utf-8", url="/redirected/">'
         self.assertEqual(repr(response), expected)
 
+    def test_invalid_redirect_repr(self):
+        """
+        If HttpResponseRedirect raises DisallowedRedirect, its __repr__()
+        should work (in the debug view, for example).
+        """
+        response = HttpResponseRedirect.__new__(HttpResponseRedirect)
+        with self.assertRaisesMessage(DisallowedRedirect, "Unsafe redirect to URL with protocol 'ssh'"):
+            HttpResponseRedirect.__init__(response, 'ssh://foo')
+        expected = '<HttpResponseRedirect status_code=302, "text/html; charset=utf-8", url="ssh://foo">'
+        self.assertEqual(repr(response), expected)
+
     def test_not_modified(self):
         response = HttpResponseNotModified()
         self.assertEqual(response.status_code, 304)