code: def send(self, request: Request, stack: Stack) -> Coroutine:
          
  
          if stack.annotation not in self.PATTERNS:
              if not self.accept(stack):
                  raise UnacceptableStack('Cannot accept stack {}'.format(stack))
  
          func = getattr(self, '_send_' + stack.annotation)
          return func(request, stack)
docs: Send a stack to the platform.
  
          Actually this will delegate to one of the `_send_*` functions depending
          on what the stack looks like.