code: func NegotiateInputSerializer(req *http.Request, streaming bool, ns runtime.NegotiatedSerializer) (runtime.SerializerInfo, error) {
  	mediaType := req.Header.Get("Content-Type")
  	return NegotiateInputSerializerForMediaType(mediaType, streaming, ns)
  }
docs: // NegotiateInputSerializer returns the input serializer for the provided request.