func isUnsupportedTEError(err error) bool {
	_, ok := err.(*unsupportedTEError)
	return ok
}

// parseTransferEncoding sets t.Chunked based on the Transfer-Encoding header.
func (t *transferReader) parseTransferEncoding() error {
	raw, present := t.Header["Transfer-Encoding"]
	if !present {
		return nil
	}
	delete(t.Header, "Transfer-Encoding")