I want to changed the request verb of a request in the case a
parameter _method is provided, for example if a POST request comes in
with a parameter _method=PUT, I need to change the request to call the
put method of the handler. This is to cope with the way prototype.js
works with verbs like PUT and DELETE(workaround for IE). Here is my
first attempt:

class MyRequestHandler(webapp.RequestHandler):
    def initialize(self, request, response):
        m = request.get('_method')
        if m:
            request.method = m.upper()
        webapp.RequestHandler.initialize(self, request, response)

The problem is, for some reason whenever the redirect is done, the
self.request.params are emptied by the time the handling method(put or
delete) is called, even though they were populated when initialize is
called. Anyone have a clue why this is? As a workaround I thought I
could clone the params at initialize() time, but .copy() did not work,
and I haven't found a way to do that either.

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