This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Nope. I suppose if you are also coding the webservice that you are calling you can set a custom header containing the request URL on its response. You can access the response headers from ClientHttpResponse.