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Testing HTTPS In Native APPs
Over on Twitter, Paul asks how to verify that a native application is using TLS. For a PC, it’s pretty simple, just run Fiddler and watch the traffic. If you see any HTTP requests (other than those...
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Tuning MemoryStream
By day, I build the Fiddler Web Debugger. I’ve recently started integrating telemetry collection into the application for automated exception reporting and to collect information about the user’s...
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API Testing with Telerik Fiddler
Fiddler has long been the tool of choice for developers and testers who are building and verifying APIs exposed over HTTP(S). In this post, we’ll explore the existing features Fiddler offers for API...
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What’s New in Fiddler 4.6
Telerik Fiddler version 4.6 (and v2.6 targeting .NET2) is now available for download. The new version includes several new features and dozens of tweaks and bugfixes, described in this article. View...
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Fiddler Certificate Generators
Fiddler and FiddlerCore offer three different choices for generating interception certificates: MakeCert CertEnroll Bouncy Castle If you’re so inclined, you can even write your own certificate...
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Fiddler and Brotli
Regular readers of my blog know how excited I am about Google’s new open compression engine, Brotli. Support is in Firefox 44 Nightly already and is expected for other browsers. Because Brotli is used...
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Viewing HTTPS Handshakes in Fiddler
You can easily use Fiddler to evaluate what algorithms a client is using to connect to a HTTPS server in Fiddler. First, adjust Fiddler’s configuration using Tools > Fiddler Options to enable...
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What’s New in Fiddler 4.6.0.7
TLDR? – Get the newest Fiddler here. We’re performing a staged rollout of this build; it won’t be on autoupdate until next week. Under the Hood As mentioned in our notes about the Fiddler 4.6 release,...
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Reset Fiddler’s HTTPS certificates
I’ve made changes to the latest versions of Fiddler to improve the performance of certificate creation, and to avoid problems with new certificate validation logic coming to Chrome and Firefox. The...
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Repairing Corrupt ZIP Files
Fiddler’s default file format is the SAZ Format, which is just a ZIP file with a particular structure. Unfortunately, sometimes users’ SAZ files get corrupted due to failing disks or incomplete...
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Book-Writing: Just Do It!
Sadly, you’re unlikely to get wealthy by writing a book. You should definitely write one anyway. My Background People I respect suggest you shouldn’t write (or buy) books on specific technologies,...
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What’s New in Fiddler 4.6.2
TLDR? – Get the newest Fiddler here. It’s been just over two months since the last significant release, and Fiddler 4.6.2.0 (and v2.6.2.0) are now available. As always, the latest build includes a slew...
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Automatically Evaluating Compressibility
Fiddler’s Transformer tab has long been a simple way to examine the use of HTTP compression of web assets, especially as new compression engines (like Zopfli) and compression formats (like Brotli)...
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Fiddler Certificate Generators
Fiddler and FiddlerCore offer three different choices for generating interception certificates: MakeCert CertEnroll Bouncy Castle If you’re so inclined, you can even write your own certificate...
View ArticleClik here to view.
Fiddler and Brotli
Regular readers of my blog know how excited I am about Google’s new open compression engine, Brotli. Support is in Firefox 44 Nightly already and is expected for other browsers. Because Brotli is used...
View ArticleClik here to view.
Viewing HTTPS Handshakes in Fiddler
You can easily use Fiddler to evaluate what algorithms a client is using to connect to a HTTPS server in Fiddler. First, adjust Fiddler’s configuration using Tools > Fiddler Options to enable...
View ArticleClik here to view.
What’s New in Fiddler 4.6.0.7
TLDR? – Get the newest Fiddler here. We’re performing a staged rollout of this build; it won’t be on autoupdate until next week. Under the Hood As mentioned in our notes about the Fiddler 4.6 release,...
View ArticleClik here to view.
Reset Fiddler’s HTTPS certificates
I’ve made changes to the latest versions of Fiddler to improve the performance of certificate creation, and to avoid problems with new certificate validation logic coming to Chrome and Firefox. The...
View ArticleClik here to view.
Repairing Corrupt ZIP Files
Fiddler’s default file format is the SAZ Format, which is just a ZIP file with a particular structure. Unfortunately, sometimes users’ SAZ files get corrupted due to failing disks or incomplete...
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