PATCH method handler on Google AppEngine WebApp2

google-app-engine, http-patch, webapp2

Solution

Just use a monkey patch by performing this before creating a `WSGIApplication`:

allowed_methods = webapp2.WSGIApplication.allowed_methods
new_allowed_methods = allowed_methods.union(('PATCH',))
webapp2.WSGIApplication.allowed_methods = new_allowed_methods

There is a current patch on the `webapp2` issue tracker but no one has picked it up.

Problem

I tried to use a `def patch():` method in my `webapp2.RequestHandler` to support partial resource updates, but then saw that the allowed methods are frozen in webapp2.py: ``` allowed_methods = frozenset(('GET', 'POST', 'HEAD', 'OPTIONS', 'PUT', 'DELETE', 'TRACE')) ``` How can I extend `webapp2.RequestHandler` or modify the `WSGIApplication` class to allow the PATCH HTTP method when deployed on Google AppEngine?

Original source