I looked at the bug report you mentioned. The bug report deals with Frontier::Client - but that's not the location of the bug I am seeing. The bug I am seeing appears after the method has been invoked, and in fact, after the method has returned but before the XML is returned to the caller. I have also been looking at the code. The error message is occuring down in Net::HTML which is being called by the CGI module. I'm still trying to figure out the path from Responder thru the CGI module. But so far, I've not seen anything obviously wrong, nor any simple way to get a look at the headers that the code believes are present.