Setting "Transfer-Encoding : chunked" programatically with netty HttpHeaders was forbidden in previous versions

HttpRequest request = new DefaultFullHttpRequest(
HttpVersion.HTTP_1_1, HttpMethod.GET, testURL.toString());
HttpHeaders headers = request.headers();
      
headers.set("Transfer-Encoding ", "chunked");

was throwing an exception with a message ... "a header name cannot contain the following prohibited characters"