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Fiddler in 2025

The Fiddler Web Debugger is now old enough to drink, but I still use it pretty much every day. Fiddler hasn’t aged entirely gracefully as platforms and standards have changed over the decades, but the...

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Understanding SmartScreen and Network Protection

The vast majority of cyberthreats arrive via one of two related sources: That means that by combining network-level sensors and throttles with threat intelligence (about attacker sites), security...

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Fiddler – My Mistakes

On a flight back from Redmond last week, I finally read Linus Torvalds’ 2002 memoir “Just For Fun.” I really enjoyed its picture of Linux (and Torvalds) early in its success, with different chapters...

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Capturing Logs for Debugging SmartScreen

The Microsoft Edge browser makes use of a service called Microsoft Defender SmartScreen to help protect users from phishing websites and malicious downloads. The SmartScreen service integrates with a...

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Edge’s Super-Res Image Enhancement

One interesting feature that the Edge team is experimenting with this summer is called “SuperRes” or “Enhance Images.” This feature allows Microsoft Edge to use a Microsoft-built AI/ML service to...

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Extending Fiddler’s ImageView

Fiddler’s ImageView Inspector offers a lot of powerful functionality for inspecting images and discovering ways to shrink an image’s byte-weight without impacting its quality. Less well-known is the...

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Fiddler And LINQ

Since moving to Google at the beginning of 2016, I’ve gained some perspective about my work on Fiddler over the prior 12+ years. Mostly, I’m happy about what I accomplished, although I’m a bit awed...

View Article

Image may be NSFW.
Clik here to view.

Fiddler in 2025

The Fiddler Web Debugger is now old enough to drink, but I still use it pretty much every day. Fiddler hasn’t aged entirely gracefully as platforms and standards have changed over the decades, but the...

View Article


Image may be NSFW.
Clik here to view.

Understanding SmartScreen and Network Protection

The vast majority of cyberthreats arrive via one of two related sources: That means that by combining network-level sensors and throttles with threat intelligence (about attacker sites), security...

View Article


Image may be NSFW.
Clik here to view.

Fiddler – My Mistakes

On a flight back from Redmond last week, I finally read Linus Torvalds’ 2002 memoir “Just For Fun.” I really enjoyed its picture of Linux (and Torvalds) early in its success, with different chapters...

View Article

Image may be NSFW.
Clik here to view.

Capturing Logs for Debugging SmartScreen

The Microsoft Edge browser makes use of a service called Microsoft Defender SmartScreen to help protect users from phishing websites and malicious downloads. The SmartScreen service integrates with a...

View Article

Image may be NSFW.
Clik here to view.

Edge’s Super-Res Image Enhancement

One interesting feature that the Edge team is experimenting with this summer is called “SuperRes” or “Enhance Images.” This feature allows Microsoft Edge to use a Microsoft-built AI/ML service to...

View Article

Image may be NSFW.
Clik here to view.

Extending Fiddler’s ImageView

Fiddler’s ImageView Inspector offers a lot of powerful functionality for inspecting images and discovering ways to shrink an image’s byte-weight without impacting its quality. Less well-known is the...

View Article


Image may be NSFW.
Clik here to view.

Analyzing Network Traffic Logs (NetLog json)

Previously, I’ve described how to capture a network traffic log from Microsoft Edge, Google Chrome, and applications based on Chromium or Electron. In this post, I aim to catalog some guidance for...

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Capture Network Logs from Edge and Chrome

Problems in accessing websites can often be found and fixed if the network traffic between the browser and the website is captured as the problem occurs. This short post explains how to capture such...

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Firefox and Fiddler – Easier than Ever

In a world where software and systems seem to march inexorably toward complexity, I love it when things get simpler. Years ago, Firefox required non-obvious configuration changes to even send traffic...

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Image may be NSFW.
Clik here to view.

Fiddler And LINQ

Since moving to Google at the beginning of 2016, I’ve gained some perspective about my work on Fiddler over the prior 12+ years. Mostly, I’m happy about what I accomplished, although I’m a bit awed...

View Article


Image may be NSFW.
Clik here to view.

Chrome Deprecates Subject CN Matching

If you’re using a Self-Signed certificate for your HTTPS server, a deprecation coming to Chrome may affect your workflow. Chrome 58 will require that certificates specify the hostname(s) to which they...

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Using Fiddler With iOS 10 and Android 7

If you’ve tried to use Fiddler with iOS10 beta or Android 7 Nougat, you have probably found that HTTPS decryption isn’t working, even if you use the latest Fiddler and the Fiddler Certificate Maker...

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Silliness – Fiddler Blocks Malware

Enough malware researchers now depend upon Fiddler that some bad guys won’t even try to infect your system if you have Fiddler installed. The Malware Bytes blog post has the details, but the gist of it...

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