soap response content-length

Hi, Is it really necessary to set http content-length header in soap resonse (Server.php:214) ? I'm using mb output handler to covnert iso8 strings (hebrew) to utf-8 so ms clients can use my server, and ofcourse it changes the length of the response so the header is wrong. Right now I disabled it locally and it works great. I think others might have the same problem, and I just wondered why this header is needed at all. If it isn't possible to remove it, what about adding an option to disable it at runtime? Sagi