ericlaw

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, we’ve started taking a very close look at Fiddler’s performance. Fiddler’s use of the CPU, system memory, and theContinue reading “What’s New in Fiddler 4.6.0.7”

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 capture of CONNECT tunnels but disable decryption: Disabling decryption is necessary because Fiddler decrypts traffic using a HTTPS man-in-the-middle technique, which means thatContinue reading “Viewing HTTPS Handshakes in Fiddler”

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 inside the WOFF2 font format, many clients already have the compression code and just need to expose it in a newContinue reading “Fiddler and Brotli”

Duct Tape and Baling Wire–Cookie Prefixes

Update: Cookie Prefixes are supported by Chrome 49, Opera 36, and Firefox 50. Test page; no status from the Edge team. A new cookie feature called SameSite Cookies has been shipped by Chrome, Firefox and Edge; it addresses slightly different threats. When I worked on Internet Explorer, we were severely constrained on development resources. WhileContinue reading “Duct Tape and Baling Wire–Cookie Prefixes”

WebP–What Isn’t Google Telling Us?

Beyond their awesome work on Zopfli and Brotli, Google has brought their expertise in compression to bear on video and image formats. One of the most interesting of these efforts is WebP, an image format designed to replace the aging JPEG (lossy) and PNG (lossless) image formats. WebP offers more efficient compression mechanisms than bothContinue reading “WebP–What Isn’t Google Telling Us?”