[PYTHON] Try to imitate Rails' _method parameter in webapp2

Before default_dispatcher is called, check the _method parameter and rewrite the value of request.method to the corresponding method, so prepare your own dispatcher and set it with the app.router.set_dispatcher method.

def dispatcher(router, request, response):
    method = request.get('_method').upper()
    if method in ['HEAD', 'OPTIONS', 'PUT', 'DELETE', 'TRACE']:
        request.method = method
    return router.default_dispatcher(request, response)
    
app = webapp2.WSGIApplication([
    webapp2.Route('/foo', handler=FooHandler),
], debug=True)
app.router.set_dispatcher(dispatcher)

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