"Fiddler is a comprehensive web debugging proxy that keeps detailed track of all HTTP connections and the data exchanged between your computer and the web server. The program allows you to inspect traffic, set breakpoints, and manipulate incoming or outgoing data. Fiddler includes a powerful event-based scripting subsystem, and can be extended using any .NET language.

The program can debug traffic from virtually any application that supports a proxy connection, including IE, Chrome, Safari, Firefox, Opera, and many others. You can also use Fiddler to debug traffic from popular devices like Windows Phone, iPod/iPad, and others."

https://www.snapfiles.com/get/fiddler.html

During Installation

"We collect anonymous data about your system configuration and use of the Software to help improve future versions of the Software. This may include information relating to certain features and extensions of the Software, identifying trends and bugs, activation information, usage statistics and may track other data related to your use of the Software as further described in the most current version of Progress' Privacy Policy (located at: https://www.progress.com/legal/privacy-policy). This does not include any data that can be used to identify you, either directly or indirectly. If you would like to disable this feature, you may do so in the Options dialog."

Home Page
https://www.telerik.com/fiddler/fiddler-classic/

Release History
https://www.telerik.com/support/whats-new/fiddler/release-history

Download
http://www.telerik.com/docs/default-source/fiddler/fiddlersetup.exe

Requires .NET Framework v4 (Included with Win10)