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Introducing Fiddler. Web Debugging for Performance and Operations About Eric. Program Manager - Internet Explorer IE7: Networking; IE8: Security Developer of TamperIE, IEToys, Fiddler, Meddler, etc…. What is Fiddler?. Freeware Web Debugging Platform

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Introducing Fiddler

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Introducing fiddler l.jpg

Introducing Fiddler

  • Web Debugging for Performance and Operations


About eric l.jpg

About Eric

  • Program Manager - Internet Explorer

    IE7: Networking; IE8: Security

  • Developer of TamperIE, IEToys, Fiddler, Meddler, etc…

What is fiddler l.jpg

What is Fiddler?

  • Freeware Web Debugging Platform

  • Easily installed from

  • Runs as a local proxy; registers as system proxy while capturing

  • View, analyze and modify web traffic from any application that supports a proxy; including most devices (e.g. Windows Mobile)

  • Enables HTTPS interception via self-signed certificate

  • Extremely extensible, via JavaScript or .NET assemblies

Intercepting web traffic l.jpg

Intercepting Web Traffic

Https support l.jpg

HTTPS support

  • Man-in-the-middle – Intercepts HTTPS CONNECT tunnels and shows raw traffic

Fiddler for performance l.jpg

Fiddler for Performance

  • Measure / analyze / simulate the end-user experience.

    • Measure request size, page weight

    • Analyze caching, compression, page composition

    • Simulate low-speed / high-latency connections

Performance statistics l.jpg

Performance Statistics

Session timeline l.jpg

Session Timeline

Filters l.jpg


Custom rules l.jpg

Custom Rules

Traffic modification l.jpg

Traffic Modification

  • Redirect requests to a particular datacenter

  • Simulate a downed server

  • Prototype the performance cost of site changes

  • Etc…

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Traffic Archives

  • Preserves the traffic and timings in compressed .SAZ (Session Archive ZIP) format

  • Great for regressing bugs

  • Remote user capture using FiddlerCap

Fiddlercap www fiddlercap com l.jpg

FiddlerCap -

Meddler www fiddler2 com meddler l.jpg

Meddler -

Learn more l.jpg

Learn More…

  • for tutorials, demonstration videos, references, RSS, and the Fiddler Discussion Group

  • for performance-related content

  • Login