code: def sse_content(response, handler, **sse_kwargs):
      
      # An SSE response must be 200/OK and have content-type 'text/event-stream'
      raise_for_not_ok_status(response)
      raise_for_header(response, 'Content-Type', 'text/event-stream')
  
      finished, _ = _sse_content_with_protocol(response, handler, **sse_kwargs)
      return finished
docs: Callback to collect the Server-Sent Events content of a response. Callbacks
      passed will receive event data.
  
      :param response:
          The response from the SSE request.
      :param handler:
          The handler for the SSE protocol.