Is there a way to measure the size of a web service response?

I have a .NET desktop client application which references some .NET web services. I'd like to see the size of the responses开发者_运维问答 the client application is receiving. Is there a way to do this? I've tried using Wireshark, but I can't see packets when the host and destination are both localhost.

Fiddler allows you to see and debug all HTTP traffic, also on localhost. You might need to setup proxy for localhost in the system.net configuration section.

I use SoapUI to test my web services and it will give detailed statistics on size of header, payload, etc.