Fiddler

Short description: HTTP debugging proxy server

Fiddler

Screenshot of Fiddler Everywhere logging HTTP/S network calls

Original author(s)| Eric Lawrence[1]
Developer(s)| Telerik
Initial release| 6 October 2003; 22 years ago (2003-10-06)[2]
Operating system| Windows and later, macOS, and Linux[3]
Type| Packet analyzer
Website| {{{1}}}

Fiddler is a debugging proxy server tool used to log, inspect, and alter HTTP and HTTPS traffic between a computer and a web server or servers. Fiddler was originally written by Eric Lawrence while a Program Manager on the Internet Explorer development team at Microsoft.[1]

The usage of the name “Fiddler” has broadened to encompass additional products and tools provided by Progress Telerik including Fiddler Classic, Fiddler Everywhere, Fiddler Core, Fiddler Cap, and Fiddler Jam.

## Contents

* 1 Features
* 2 History
* 3 See also
* 4 References
* 5 Further reading
* 6 External links

## Features

Fiddler captures HTTP and HTTPS traffic and logs it for the user to review. The logging is performed by implementing man-in-the-middle interception using self-signed certificates.[4] Fiddler can be used to edit network sessions by setting breakpoints to pause the processing of requests and permitting the alteration of the request and/or response.

The Fiddler Ecosystem offers different products and tools to address specific use cases:

* Fiddler Classic is the original (and free) debugging proxy tool for Windows only.
* Fiddler Everywhere is the next generation of Fiddler. Fiddler Everywhere runs on macOS, Windows, and Linux, and has built-in team collaboration and an enhanced UI.
* Fiddler Core is a .NET library allowing you to capture and modify HTTP and HTTPS traffic.
* Fiddler Cap is a lightweight Windows-only tool designed for non-technical users to capture web traffic and then share the data within the team for debugging.
* Fiddler Jam is a web-based troubleshooting solution for support teams looking to capture web traffic, web logs and web app screenshots without requiring any programming.

## History

On 6 October 2003, Eric Lawrence released the first official version of Fiddler.[2]

On 12 September 2012, Fiddler was acquired by Telerik and the original author joined the company to work on Fiddler on a full-time basis.[5]

On 22 December 2015, Eric Lawrence announced[6] he was leaving Telerik and the Fiddler project.

On 3 October 2019, Progress Telerik released version 5 of Fiddler.[7]

On 1 June 2020, Progress Telerik released a beta version of Fiddler Everywhere.[8]

On 18 September 2020, Progress Telerik announced the RTW version of Fiddler Everywhere 1.0.[9]

On 29 June 2021, Progress Telerik announced the release of Fiddler Everywhere 2.0.[10]

On 28 September 2021, Progress Telerik announced the RTW version of Fiddler Jam.[11]

## See also

* Packet analyzer – a computer program or piece of computer hardware that can intercept and log traffic that passes over a digital network
* Comparison of packet analyzers
* Charles Proxy – proxy server for debugging web traffic, similar to Fiddler

## References

1. ↑ 1.0 1.1 Lawrence, Eric (2005-06-06). "HTTP Performance". IEBlog. MSDN (Microsoft). https://docs.microsoft.com/en-us/archive/blogs/ie/http-performance.
2. ↑ 2.0 2.1 "Fiddler v1.x Release History". Telerik. https://www.telerik.com/support/whats-new/fiddler/release-history/fiddler-v1.x.
3. ↑ "Fiddler Web Debugger - Get Fiddler". https://www.telerik.com/download/fiddler.
4. ↑ Lawrence, Eric (January 2005). "Fiddler PowerToy - Part 1: HTTP Debugging". MSDN (Microsoft corporation). https://docs.microsoft.com/en-us/previous-versions/ms976395(v=msdn.10).
5. ↑ Lawrence, Eric (September 2012). "Fiddler Telerik". Fiddler. http://www.fiddler2.com/fiddler/LetterFromEric.asp.
6. ↑ Lawrence, Eric (December 2015). "Fiddler - A Segue". Telerik. https://www.telerik.com/blogs/fiddler-a-segue.
7. ↑ Velikov, Kamen (October 2019). "What's New in Fiddler for Windows v5.0.20194". Telerik. https://www.telerik.com/blogs/what's-new-in-fiddler-for-windows-v5.0.20194.
8. ↑ Velikov, Kamen (June 2020). "Fiddler Everywhere v0.10 is Here!". Telerik. https://www.telerik.com/blogs/fiddler-everywhere-v0-10.
9. ↑ Pereira, Jonathan (September 2020). "Fiddler Everywhere 1.0 is Here!". Telerik. https://www.telerik.com/blogs/fiddler-everywhere-web-debugging-official-release.
10. ↑ Yaneva, Simona (June 2021). "New Release: Fiddler Everywhere 2.0 Is Here!". Telerik. https://www.telerik.com/blogs/new-release-fiddler-everywhere-2.0.
11. ↑ Yaneva, Simona (September 2021). "What's New in Fiddler Jam". Telerik. https://www.telerik.com/blogs/whats-new-telerik-fiddler-jam.

## Further reading

* Lawrence, Eric (16 February 2016). Debugging with Fiddler: The complete reference from the creator of the Fiddler Web Debugger 2nd Edition. ISBN 978-1511572903.

## External links

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