Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet.
Created by Telerik (Eric Lawrence)
Fiddler is not available for Google Chrome but there are a few alternatives with similar functionality. The most popular Google Chrome alternative is Advanced REST Client (ARC), which is both free and Open Source. If that doesn't suit you, our users have ranked 42 alternatives to Fiddler and three of them are available for Google Chrome so hopefully you can find a suitable replacement. Other interesting Google Chrome alternatives to Fiddler are HTTP Header Live (Free, Open Source) and Live HTTP Headers (Chrome) (Free).