  urlpatterns = [
      path("", hello),
      path("file/", lambda x: FileResponse(open(test_filename, "rb"))),
      path("meta/", hello_meta),
      path("wait/", sync_waiter),
  ]
 
</s> remove         if request is None:
            await self.send_response(error_response, send)
            return
        # Get the response, using the async mode of BaseHandler.
        response = await self.get_response_async(request)
        response._handler_class = self.__class__
 </s> add 
    path("post/", post_echo),
  urlpatterns = [
      path("", hello),
      path("file/", lambda x: FileResponse(open(test_filename, "rb"))),
      path("meta/", hello_meta),
    path("post/", post_echo),
      path("wait/", sync_waiter),
  ]
keep keep keep add keep keep
 Fixed #33754 -- Fixed crash with prematurely closed ASGI request body.

Regression in 441103a04d1d167dc870eaaf90e3fba974f67c93. 
tests/asgi/urls.py