Simplified HEAD handling for method views

CHANGES

@@ -43,6 +43,8 @@ Relase date to be decided, codename to be chosen.
 - Fixed an issue where the test client if used with the with statement did not
   trigger the execution of the teardown handlers.
 - Added finer control over the session cookie parameters.
+- HEAD requests to a method view now automatically dispatch to the `get`
+  method if no handler was implemented.
 
 Version 0.7.3
 -------------

flask/testsuite/views.py

@@ -110,6 +110,41 @@ class ViewTestCase(FlaskTestCase):
         self.assert_equal(rv.headers['X-Parachute'], 'awesome')
         self.assert_equal(rv.data, 'Awesome')
 
+    def test_implicit_head(self):
+        app = flask.Flask(__name__)
+
+        class Index(flask.views.MethodView):
+            def get(self):
+                return flask.Response('Blub', headers={
+                    'X-Method': flask.request.method
+                })
+
+        app.add_url_rule('/', view_func=Index.as_view('index'))
+        c = app.test_client()
+        rv = c.get('/')
+        self.assert_equal(rv.data, 'Blub')
+        self.assert_equal(rv.headers['X-Method'], 'GET')
+        rv = c.head('/')
+        self.assert_equal(rv.data, '')
+        self.assert_equal(rv.headers['X-Method'], 'HEAD')
+
+    def test_explicit_head(self):
+        app = flask.Flask(__name__)
+
+        class Index(flask.views.MethodView):
+            def get(self):
+                return 'GET'
+            def head(self):
+                return flask.Response('', headers={'X-Method': 'HEAD'})
+
+        app.add_url_rule('/', view_func=Index.as_view('index'))
+        c = app.test_client()
+        rv = c.get('/')
+        self.assert_equal(rv.data, 'GET')
+        rv = c.head('/')
+        self.assert_equal(rv.data, '')
+        self.assert_equal(rv.headers['X-Method'], 'HEAD')
+
 
 def suite():
     suite = unittest.TestSuite()

flask/views.py

@@ -143,5 +143,9 @@ class MethodView(View):
 
     def dispatch_request(self, *args, **kwargs):
         meth = getattr(self, request.method.lower(), None)
-        assert meth is not None, 'Not implemented method'
+        # if the request method is HEAD and we don't have a handler for it
+        # retry with GET
+        if meth is None and request.method == 'HEAD':
+            meth = getattr(self, 'get', None)
+        assert meth is not None, 'Not implemented method %r' % request.method
         return meth(*args, **kwargs)