Fiddler before Fiddler

I think origin stories are fun. I spoke about the origins of Fiddler in my talk at the PDC last year, and it was interesting to share how a little idea bloomed into a surprisingly widely-used piece of software. Cleaning up some old hard drives a few weeks ago, I found an old UI prototype that…

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Fiddler and the IE9 Release Candidate

I’m delighted to announce that the now-available IE9 RC includes three significant enhancements for users of proxy-based debuggers like Fiddler. These improvements are: The default Connections-Per-Proxy limit has been raised from 6 to 12, improving performance and in some cases reducing Observer Effect. Debugging of traffic sent to Localhost / 127.0.0.1 now “just works”—configuration changes…

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New Features in Fiddler 2.2.9.9 Beta

New features and fixes in the Beta. The Find Sessions feature (CTRL+F) now supports searching with regular expressions. Enhanced the “Compare Sessions” feature on the context menu (set fiddler.differ.ultradiff = “False” if you don’t like it) Use a preference to persist the Scaling Mode preference in the Image Inspector Fix bug whereby the URL https://something/http://something would be…

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FiddlerCap Now in Six Languages

The FiddlerCap Web Traffic Recorder allows non-technical end-users to collect Web Traffic captures, and send those captures to a debugging buddy for analysis. I recently updated FiddlerCap and it can now render in any of six languages: English, Spanish, French, Japanese, Russian, and Portuguese. The product UI was translated by members of the Fiddler community,…

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Fiddler’s New Import and Export Architecture

All versions of Fiddler support a rich extensibility model that enables developers to enhance Fiddler with new functionality useful for traffic inspection, analysis, and sharing. However, writing extensions that import traffic captured by other tools was difficult, and extensions that offered traffic export often extended the UI in confusing ways or failed to implement basic…

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Announcing Fiddler 2.2.9

The Beta version of Fiddler 2.2.9 is now available for download. The update notification’s changelist hits the highlights, but there’s a ton of new goodies in the new version which I’ll be talking about over the next week or so. Beyond a huge crop of architectural and performance improvements, there are tons of bugfixes and…

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