publish Password protected feeds and atom using WCF service

Question

I have a WCF service to publish feeds and atom. The tricky things is need to publish password protected feeds that too passing userid and password along with URL.

Since WCF REST support bindbyposition and bindbyparameter name, just i would like to know how to allow & extract userid and password from webget url into wcf service.

Please any have idea or experienced with this issue, pls can you send your comments and valid points..

• Vijay