在開發WCF或者xml webservice，而用戶端不是.net； 或者是用.net開發其它語言寫的web service的時候。
fiddler是非常有用的工具用於抓取soap message，並進行分析。
但是當你使用fiddler監控對本地service的調用是，經常會看不到任何http包。
解決方法很簡單， 使用localhost.而不是localhost.
例如http://localhost.:4543/wcfapp 而不是 http://localhost:4543/wcfapp
fiddler: http://www.fiddler2.com/fiddler2/
What is Fiddler?
Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect traffic, set breakpoints, and "fiddle" with incoming or outgoing data. Fiddler includes a powerful event-based scripting subsystem, and can be extended using any .NET language.
Fiddler is freeware and can debug traffic from virtually any application that supports a proxy, including Internet Explorer, Google Chrome, Apple Safari, Mozilla Firefox, Opera, and thousands more. You can also debug traffic from popular devices like Windows Phone, iPod/iPad, and others.
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