def _add_dispatcher(self, path_regex, dispatch_function):
self._dispatchers.append((re.compile(path_regex), dispatch_function))<EOL>
Add a request path and dispatch handler.

        Args:
          path_regex: A string regex, the path to match against incoming requests.
          dispatch_function: The function to call for these requests.  The function
            should take (request, start_response) as arguments and
            return the contents of the response body.