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Fiddler
Screenshot of Fiddler Everywhere logging HTTP/S network calls
Original author(s)	Eric Lawrence^[1]
Developer(s)	Telerik
Initial release	6 October 2003; 17 years ago^[2]
Operating system	Windows and later, macOS, and Linux^[3]
Type	Packet analyzer
Website	www.telerik.com/fiddler

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 Pro, Fiddler Core, Fiddler Cap, and Fiddler Jam.

Features[edit]

Fiddler is a Web Debugging Proxy which logs all HTTP (S) traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP (S) 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 a third party Telerik’s tool used to log, inspect, and alter HTTP and HTTPS traffic between a computer and a web server or servers. It is not our product, this article is just to show you how you can analyze the API Request and Response call made from our Tasks/Components/Drivers. Fiddler is a tool for debugging web traffic. It's particularly helpful because you can customize it for specific needs using extensions and add-ons, and the tool provides a lot of useful information specific to web traffic.

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 Pro is the next generation of Fiddler. Fiddler Everywhere Pro 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 version of Fiddler designed for non-technical users to capture web traffic and then share the data within the team for debugging.
Fiddler Jam (Pilot) 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[edit]

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.

Proline above ground pool filter manual. 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]

See also[edit]

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

References[edit]

^ ^a^bLawrence, Eric (6 June 2005). 'HTTP Performance'. IEBlog. MSDN (Microsoft).
^ ^a^b'Fiddler v1.x Release History'. Telerik. Retrieved 7 October 2019.
^'Fiddler Web Debugger - Get Fiddler'. Retrieved 18 September 2019.
^Lawrence, Eric (January 2005). 'Fiddler PowerToy - Part 1: HTTP Debugging'. MSDN (Microsoft corporation). Retrieved 7 October 2019.
^Lawrence, Eric (September 2012). 'Fiddler Telerik'. Fiddler. Archived from the original on 12 September 2012.
^Lawrence, Eric (December 2015). 'Fiddler - A Segue'. Telerik.
^Velikov, Kamen (October 2019). 'What's New in Fiddler for Windows v5.0.20194'. Telerik.
^Velikov, Kamen (June 2020). 'Fiddler Everywhere v0.10 is Here!'. Telerik.
^Pereira, Jonathan (September 2020). 'Fiddler Everywhere 1.0 is Here!'. Telerik.

Further reading[edit]

Lawrence, Eric (16 February 2016). Debugging with Fiddler: The complete reference from the creator of the Fiddler Web Debugger 2nd Edition. ISBN978-1511572903.

External links[edit]

Official website

Retrieved from 'https://en.wikipedia.org/w/index.php?title=Fiddler_(software)&oldid=1006974817'

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Fiddler is a tool for debugging web traffic. It's particularly helpful because you can customize it for specific needs using extensions and add-ons, and the tool provides a lot of useful information specific to web traffic.

Assumptions

You have PuTTY on your developer box or an alternative for SSH
The instructions below make the assumption of a IoT Core VM but will work on any IoT Core device

Initial Setup

Download and install the latest version of Fiddler on your developer box if you haven't already
Start Fiddler and make the following setting updates under Tools -> Telerik Fiddler Options -> HTTPS tab
- Check Capture HTTPS CONNECTs
- Check Decrypt HTTPS Traffic -> from all processes
- Click on the 'Certificates generated by' link and select MakeCert engine(Recommendation: Restart Fiddler for this change to take effect)
- Next, export the FiddlerRoot.cer file via Actions -> Export Root Certificate To Desktop
Make the following setting updates under Tools -> Telerik Fiddler Options -> Connections tab:
- Setup Fiddler to act as a system proxy by checking Allow Remote Computers to Connect
- Fiddler listens on port should be set to 8888

Note: You should restart Fiddler after this and accept any UAC prompt.

Transfer and Import Fiddler Root Certificate

You'll need to import the Fiddler root certificate to your IoT image or device in order to debug https traffic routing through your PC. To do this:

Mount the VHD file (right click on the VHD and choose mount) or connect to your IoT device via PuTTY (or alternative SSH client)
Browse to the mainOS partition and create a test folder at root (via SSH, use md c:test)
Copy FiddlerRoot.cer you generated above (should be on your desktop by default) to the test folder location
If using a VHD, unmount it by ejecting any of the mounted drives a