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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def process_debug_request(self, req):
 """ Debgging helper used for testing, processes the given request and dumps the internal state of cached user to group mappings. Note that this is only callable if TRAC_GITHUB_ENABLE_DEBUGGING is set in the environment. """

        req.send(json.dumps(self._fetch_groups()).encode('utf-8'), 'application/json', 200)