Fixed last commit and added test

flask/app.py

@@ -1283,6 +1283,10 @@ class Flask(_PackageBoundObject):
         .. versionadded:: 0.3
         """
         handlers = self.error_handler_spec.get(request.blueprint)
+        # Proxy exceptions don't have error codes.  We want to always return
+        # those unchanged as errors
+        if e.code is None:
+            return e
         if handlers and e.code in handlers:
             handler = handlers[e.code]
         else:
@@ -1327,12 +1331,8 @@ class Flask(_PackageBoundObject):
         # ensure not to trash sys.exc_info() at that point in case someone
         # wants the traceback preserved in handle_http_exception.  Of course
         # we cannot prevent users from trashing it themselves in a custom
-        # trap_http_exception method so that's their fault then.  Proxy
+        # trap_http_exception method so that's their fault then.
-        # exceptions generally must always be trapped (filtered out by
+        if isinstance(e, HTTPException) and not self.trap_http_exception(e):
-        # e.code == None)
-        if isinstance(e, HTTPException) \
-           and e.code is not None \
-           and not self.trap_http_exception(e):
             return self.handle_http_exception(e)
 
         blueprint_handlers = ()

flask/testsuite/regression.py

@@ -86,7 +86,32 @@ class MemoryTestCase(FlaskTestCase):
             safe_join('/foo', '..')
 
 
+class ExceptionTestCase(FlaskTestCase):
+
+    def test_aborting(self):
+        class Foo(Exception):
+            whatever = 42
+        app = flask.Flask(__name__)
+        app.testing = True
+        @app.errorhandler(Foo)
+        def handle_foo(e):
+            return str(e.whatever)
+        @app.route('/')
+        def index():
+            raise flask.abort(flask.redirect(flask.url_for('test')))
+        @app.route('/test')
+        def test():
+            raise Foo()
+
+        with app.test_client() as c:
+            rv = c.get('/')
+            self.assertEqual(rv.headers['Location'], 'http://localhost/test')
+            rv = c.get('/test')
+            self.assertEqual(rv.data, '42')
+
+
 def suite():
     suite = unittest.TestSuite()
     suite.addTest(unittest.makeSuite(MemoryTestCase))
+    suite.addTest(unittest.makeSuite(ExceptionTestCase))
     return suite