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Fiddler Changelog

What's new in Fiddler 5.7.1 Everywhere

Mar 27, 2024
  • gRPC capturing hangs when there is a call without request/response parameters

New in Fiddler 3.0.1 Everywhere (Dec 15, 2021)

  • FIXED:
  • The app freezes after inspecting requests with form-data body
  • Screen for inability to merge accounts has incorrect content
  • Unable to use the application when quota exceeded dialog is shown
  • The app freezes when there's a filter on 'Rules modified' column and app is restarted
  • Shared Rulesets might not be editable by the owner
  • Tab selection and grid within the Inspectors are missing when the session does not have data for the currently selected inspector

New in Fiddler 5.0.20211.51073 Classic (Dec 15, 2021)

  • NEW:
  • Change the name to Progress Telerik Fiddler Classic
  • Add Cross-Origin headers to Response Header Security section
  • Throw HTTP protocol violation when a header name contains a space
  • FIXED:
  • TLS ClientHello and ServerHello parsing fails when there are large extensions
  • Change the validity period for dynamically created certificates in Fiddler Classic to be less than an year
  • Update Set-Cookie header template as it is expired
  • HostnameIs method might return true even when host does not match when it has port
  • Incorrectly strips Authorization header if it happens to contain the letters NTLM
  • Fiddler Auth Inspector should decode BASIC credentials using Encoding.UTF8
  • Error window at launch may be hard to find
  • TLS Handshake Analyzer omits the last value in the supported_versions extension
  • Process picker option is not working for Chromium based browsers
  • "Set AutoResponder comment" hotkey moves list selection

New in Fiddler 5.0.20192.25091 (Oct 3, 2019)

  • Security fix CVE-2019-12097
  • Update all copyright strings to Progress Software EAD
  • Various bugfixes and improvements

New in Fiddler 5.0.20182.28034 (Jun 29, 2018)

  • Publish Fiddler Chocolatey package
  • Report the usage of all features with the analytics
  • Update all copyright strings to Telerik EAD
  • Various bugfixes and improvements

New in Fiddler 5.0.20181.13826 (Mar 15, 2018)

  • Improvements in Fiddler Orchestra
  • Various bugfixes and improvements

New in Fiddler 5.0.20173.50948 (Mar 15, 2018)

  • Android Client Added for Fiddler Orchestra
  • Non-Fiddler generated certificate can be used in Fiddler Orchestra .NET Core Client reverse HTTPS proxy

New in Fiddler 5.0.20173.49666 (Mar 15, 2018)

  • Fiddler now built AnyCPU and not x86

New in Fiddler 4.6.20172.31233 (Jul 21, 2017)

  • Fiddler installs per user now. Multiple installations can coexist on the same machine
  • Minor fixes and improvements.

New in Fiddler 4.6.20171.26113 (Jun 16, 2017)

  • Updated EULA
  • Various fixes and improvements

New in Fiddler 4.6.20171.14978 (Jun 16, 2017)

  • Fixed "Ignore server certificate errors(unsafe)" checkbox being checked by default.
  • Fixed ServerChatter NullReference exception.
  • Transformed the PDBs to MDBs for Linux build.
  • Implemented DescribeConnectionSecurity for MONO.
  • Fixed HTTPS for Mono 4.8.0.

New in Fiddler 4.6.20171.9220 (Jun 16, 2017)

  • Minor fixes in Fiddler and Fiddler Script Editor C# functionality
  • Improved .NET framework recognition in installer
  • Fiddler for .NET2 start up bug fixed

New in Fiddler 4.6.20171.7553 (Jan 30, 2017)

  • Added C# scripting
  • Integrated Syntax-Highlighting Add-Ons (Fiddler Script Editor) in Fiddler
  • Fixed exceptions on finding resources
  • Auto update improvements

New in Fiddler 4.6.3.44034 (Oct 25, 2016)

  • SampleRules.js now has Windows style line endings and can be conveniently edited in notepad
  • Fixed installer issue in Windows 10
  • Improved update

New in Fiddler 4.6.2.32002 (Oct 25, 2016)

  • Fixed sha1/sha256 dual sign of installer and executables
  • Added PDB files for better exception reports
  • APITest tab visible by default

New in Fiddler 4.6.2.30081 (Oct 25, 2016)

  • Fixed updater error message on successful update
  • Added signing to all Telerik Fiddelr executables
  • Improved emergency update session tool-tip behaviour

New in Fiddler 2.6.2.0 for NET 2 / 4.6.2.0 for NET 4 (Jan 4, 2016)

  • Default Certificate Generator Changed:
  • Changes coming to certificate validation in browsers and other clients mean that certificates generated by makecert.exe (previously Fiddler’s default generator) will soon be rejected. To address this problem, the default certificate generator on Windows 7 and later has been changed to CertEnroll. (Windows XP and Vista users should consider installing the similar CertMaker Addon).
  • Unfortunately, if you’re upgrading from an earlier version of Fiddler which used a different certificate generator, you may need to explicitly reset Fiddler’s certificates.
  • SAZ Repair:
  • From time to time, users have asked for help with Fiddler Session Archive files (.SAZ or .RAZ files) that are corrupt, either because they are incomplete (e.g. power failed) or they were mangled by an incomplete download or a failing disk drive.
  • Fiddler 4.6.2 includes a new feature that can recover data from corrupt Session Archive files. If the Session Archive fails to load due to corruption, you’ll be prompted to attempt a repair of the file. Data recovered from the SAZ file will be stored in a new archive and loaded for display
  • Notably, this feature may also be useful to recover corrupt .zip, .docx, .xlsx, .pptx, etc files that have nothing to do with Fiddler; give it a try!
  • FiddlerHook Removed:
  • This release removes the FiddlerHook extension for Firefox. Mozilla is changing their add-on model for Firefox extensions. Short-term, Firefox requires that extensions be signed (and Mozilla has declined to sign FiddlerHook) and over the next year, Mozilla will be removing the XUL Overlay extension model upon which FiddlerHook was based.
  • Fortunately, you don’t really need FiddlerHook to use Fiddler with Firefox. For HTTP traffic, it will often “just work” and for HTTPS traffic, only minor configuration updates are needed.
  • Decryption Control
  • Previously, Fiddler UI only allowed you to exempt certain hosts from HTTPS decryption; if you wanted to only decrypt from a small number of hosts, you were forced to use the script engine. That limitation has been removed via a new option on the Tools > Fiddler Options > HTTPS tab.
  • Extensibility Improvements:
  • This release adds a number of improvements to Fiddler’s extensibility, from both FiddlerScript and .NET extensions.
  • BindUIButton:
  • You can now add buttons to Fiddler’s toolbar in a supported way. Simply add a new BindUIButton attribute to a static method in your FiddlerScript file; the string argument is the caption with which to label the button. Toolbar buttons are added to the left of the toolbar in the order opposite of their listing within the FiddlerScript. Adding images is not supported from FiddlerScript but you can use Unicode Emoji symbols if you’d like. Fiddler extensions may add to the toolbar using the static method FiddlerToolbar.AddToolstripItem() and may remove entries using .RemoveToolstripItem().
  • Export to String:
  • In many cases, you may wish to generate a string representing one or more Sessions in either HTTPArchive (HAR) or cURL format. While you can manually use File > Export to generate files of either format, you can now skip the middle-man and export to these types in memory. To do so, simply set the ExportToString option and do not set a Filename option. After the DoExport command completes, the output is found in the OutputAsString option.
  • Invoking on the UI Thread:
  • Fiddler processes Sessions on background threads, but you should only ever manipulate Fiddler’s UI using the UI thread. Only a few of Fiddler’s UI calls are thread-safe; if you’re not sure, your script should use the new FiddlerObject.uiInvoke or FiddlerObject.uiInvokeAsync methods to avoid crashing or corrupting the user-interface.
  • Load Extensions at Runtime:
  • To support some exciting new work from the community, Fiddler now has the ability to load additional Extensions and Inspectors at runtime; this enables building of more complex add-on systems atop Fiddler’s existing system.

New in Fiddler 2.6.0.1 (Aug 19, 2015)

  • Add API Testing
  • Add View > Tabs menu
  • Reduce memory usage
  • Improve performance
  • Add HTTP Lint Filtering
  • Improve AutoResponder
  • Composer UI resizing
  • Improve Timeline
  • Support Microsoft Edge
  • ImageView improvements
  • Image Quality Explorer improvements
  • QuickSearch improvements
  • Math context menu
  • Fiddler Improvement Program
  • FiddlerApplication.BeforeFiddlerShutdown event
  • Many bugfixes

New in Fiddler 4.5.0.0 (Jul 24, 2015)

  • UI FEATURES:
  • Direct Filters:
  • A Filter submenu has been added to the Web Sessions List’s context menu. Using this menu, you can quickly use attributes of the currently selected session to remove similar traffic and prevent its display in the future. For instance, I can quickly filter out all requests to a specified target host and all previously captured and future requests to that host will be hidden. The currently enabled direct filters are listed in the new Filters Gutter beneath the QuickExec box. Right-click a filter entry to remove it. Hover over the Filters label to update the numeric counter showing how many sessions were hidden by filters listed in the gutter.
  • WebSockets:
  • The long-awaited WebSockets tab is now available. Simply double-click on any WebSocket session in the Web Sessions list. The tab offers the ability to reassemble fragmented messages, and display each message’s content using a small set of Inspectors. If your WebSocket traffic contains higher-level formats (such as binary images) you can click the Inspect as Response button to send the message to the main Web Sessions list for inspection using any Fiddler Inspector.
  • AutoSave:
  • Fiddler can now automatically save SAZ archives and clear the session list on a regular schedule. Click Tools > Configure AutoSave to show the AutoSave tab
  • SAZ Clipboard:
  • Click Tools > New Session Clipboard to create a new window into which you can drag/drop sessions you’d like to keep around outside of the main Web Sessions list
  • Text Wizard:
  • Fiddler’s TextWizard has been updated with additional formats; the old radio buttons have been replaced with a drop-down list of formats.
  • Newly supported formats include conversion To Base64URL strings (often used by Java and security protocols) and To C# byte[] strings, which enable you to easily generate C# source code for a given output, like so: byte[] arrOutput = { 0xC2, 0xAE, 0xC2, 0xA9, 0xE2, 0x98, 0x85, 0x20, 0xE2, 0x98, 0x86, 0x20 };
  • HTTPS Versions:
  • Fiddler 4 has long offered a choice of HTTPS versions (defaulting to SSL3 and TLS1.0) when talking to servers, but previously using TLS1.1 and TLS1.2 required somewhat complicated configuration steps. You can now easily control what SSL and TLS versions Fiddler offers to servers using the Enabled Protocols link on the Tools -> Fiddler Options -> HTTPS Tab
  • BSON Support:
  • Fiddler’s JSON Inspector now supports display of BSON-format binary responses
  • Composer History:
  • Fiddler’s Composer tab now includes a History pane to enable you to re-issue previously composed requests easily, without having to drag and drop from the main Web Sessions list. Simply double-click on any request in the list to update the headers and body currently in the Parsed tab.
  • IMAGE-RELATED FEATURES:
  • Image Quality Explorer:
  • The ImageView Inspector offers a new Image Quality Explorer tool that enables you to easily explore the relationship between image format/quality and file size. To invoke it, right-click an image and choose Explore Quality from the Tools submenu. The image will open in a new window. Drag the slider left to observe the impact of quality reductions on the image (shown at the top) and on the file size (shown at the bottom).
  • PNGDistill:
  • The ImageView Inspector’s Tools menu also offers the new PNGDistill tool to enable you to optimize PNG files by removing metadata and optimizing compression. While it’s easily launched by Fiddler, you can also automate the pngdistill.exe tool directly within your build and deploy scripts to ensure that performance problems are avoided before your users experience them.
  • Gallery Add-on:
  • Fiddler’s Image Gallery add-on now supports JPEG-XR and WebP images. It also supports a new slideshow mode called “picture pile” (hit the P key while in slideshow mode).
  • GENERAL IMPROVEMENTS:
  • Performance - Dozens of performance improvements have been made around Fiddler to speed:
  • The display of large bodies of text
  • Search across sessions
  • Processing of custom columns
  • Reliability Performance:
  • On Windows Vista and later, if Fiddler hangs for any reason or encounters a crashing bug, the tool will detach the proxy and preserve as many settings as it can before restarting.
  • High DPI:
  • Various improvements were made around the Fiddler for better behavior on high-DPI systems. For instance, Fiddler’s icons now include higher-resolution versions for improved scaling, and assorted UI features now resize more appropriately on high-DPI systems. Fiddler is not yet marked as a “DPI-aware” application and, thus, will use the system’s default scaling if the screen is over 150 DPI.
  • If you’d like to disable the system’s default-scaling, you can start Fiddler with the dpiAware command-line argument.
  • Windows 10 Support:
  • Fiddler now fully supports the Windows 10 preview release.
  • Import and Export:
  • Fiddler now offers an Import Folder option to bulk-load a set of SAZ files that share a common password.
  • This update also includes numerous bugfixes to PCAP, PCAPNG, and NetMon CAP import, as well as WCAT export.

New in Fiddler 2.5.0.0 (Jul 24, 2015)

  • Improvements to:
  • Composer
  • WebSockets
  • AutoSave
  • Direct filters
  • SAZClipboard
  • TextWizard
  • Image-handling
  • Windows 10 support
  • ... and much more!

New in Fiddler 2.4.9.8 (Jul 24, 2015)

  • Improve AutoResponder
  • Improve Custom Columns
  • Improve ImageView
  • HTTP/2 detection

New in Fiddler 2.4.9.0 (Jul 24, 2015)

  • Zopfli and WebP support

New in Fiddler 2.4.7.0 (Jul 24, 2015)

  • Integrate GeoEdge

New in Fiddler 2.4.6.2 (Mar 3, 2014)

  • Minor tweaks
  • Customizable icon
  • Important fix for servers with buggy socket reuse

New in Fiddler 2.4.6.1 (Feb 27, 2014)

  • Add PCAPNG support
  • Basic CTRL+Z undeletion
  • Improved Filters tab
  • New Art
  • Various bugfixes

New in Fiddler 2.4.5.9 (Feb 27, 2014)

  • Support basic CURL commands in Composer>Scratchpad
  • Add "Edit Image" to ImageView inspector
  • Improve Client Certificate handling

New in Fiddler 2.4.5.8 (Dec 11, 2013)

  • Add Packet Capture Import
  • Enhanced Composer
  • Enhanced AutoResponder
  • Enhanced Protocol Violation detection
  • Improved WebView
  • Add registry-fallback to EnableLoopback

New in Fiddler 2.4.5.6 (Oct 24, 2013)

  • Use F3/ShiftF3 to navigate Find results
  • Improved XMLView
  • Improved WebSocket support
  • Various bugfixes

New in Fiddler 2.4.3.7 Beta (Apr 10, 2013)

  • Enhanced QuickExec
  • Improved FiddlerHook
  • Many bugfixes

New in Fiddler 2.4.3.6 Beta (Mar 23, 2013)

  • Improved column customization
  • Improved performance
  • New art
  • Many bugfixes

New in Fiddler 2.4.3.0 Beta (Feb 9, 2013)

  • Improved Echo service
  • Improved column customization
  • Many bugfixes

New in Fiddler 2.4.2.6 (Jan 22, 2013)

  • Improved ImageView
  • Improved TextWizard
  • Many bugfixes

New in Fiddler 2.4.2.5 Beta (Jan 16, 2013)

  • Improved ImageView
  • Many bugfixes

New in Fiddler 2.4.2.4 (Dec 3, 2012)

  • Search-by-column
  • Protocol Violation list
  • Improved Performance
  • Enhanced AutoResponder
  • New layout option (View > Layout)
  • Enhanced Fiddler Options dialog
  • Various bugfixes

New in Fiddler 2.4.2.0 Beta (Nov 8, 2012)

  • Search-by-column
  • Protocol Violation list
  • Performance improvements
  • UI tweaks
  • Many bugfixes

New in Fiddler 2.4.1.1 (Sep 17, 2012)

  • Added Encodings panel to TextWizard
  • Support Triple-click in the Scratchpad
  • Improved EnableLoopback utility
  • Update contact addresses
  • Various bugfixes

New in Fiddler 2.4.1.0 (Aug 29, 2012)

  • Improved Timeline
  • Enhance HTTPLint
  • Various bugfixes

New in Fiddler 2.4.0.8 Beta (Aug 25, 2012)

  • Improved Timeline
  • Improved about:config
  • Improved AutoResponder
  • Various bugfixes

New in Fiddler 2.4.0.6 (Aug 17, 2012)

  • Improved performance
  • Improved screenshot
  • Improved Composer
  • Improved QuickExec
  • Improved AutoResponder
  • Many bugfixes

New in Fiddler 2.4.0.5 Beta (Aug 16, 2012)

  • Improved QuickExec
  • Improved screenshot
  • Improved performance
  • Many bugfixes

New in Fiddler 2.4.0.3 Beta (Aug 4, 2012)

  • Improved composer
  • Improved Performance
  • Add Files > Recent menu
  • Updated sounds for script load
  • Add fiddler.Lint.HTTP feature
  • Various bugfixes

New in Fiddler 2.4.0.1 Beta (Jul 10, 2012)

  • Enhanced Composer including Scratchpad feature
  • Add Copy -> Response DataURI to context menu
  • Add Reissue -> Reissue From Composer to context menu
  • Add "Automatically Authenticate" rule to Rules menu
  • Various bugfixes

New in Fiddler 2.4.0.0 (Jul 2, 2012)

  • Improved JSON decoder
  • Many bugfixes

New in Fiddler 2.3.9.9 (Jun 4, 2012)

  • Implement HTTP->FTP Gateway
  • Improved Authentication support
  • Improved request encoding support
  • Improved HAR import
  • Enhanced AutoResponder
  • Improved WebSocket support
  • Various bugfixes

New in Fiddler 2.3.9.5 (Jun 4, 2012)

  • Improved error handling
  • Minor new features

New in Fiddler 2.3.9.3 (Feb 28, 2012)

  • WebView supports all font types
  • Full TLS Extensions support
  • Improved Script Engine
  • Improved Performance
  • Various bugfixes

New in Fiddler 2.3.8.5 (Jan 25, 2012)

  • Enhanced Performance
  • Enhanced Inspectors
  • Important bugfixes

New in Fiddler 2.3.7.4 (Jan 25, 2012)

  • Major rewrite of HTTPS/WebSocket handling
  • Add File Upload to Composer (nee Request Builder)
  • Add Capture FTP checkbox
  • New overloads to BindUIColumn and AddBoundColumn to indicate column should be sorted numerically
  • Expose Original Session ID in Comments field when reloading SAZ file
  • Add HTTPS-decryption process filter
  • Add POST and quotationmark-encoding support to WCATExporter
  • In HTTPS-decryption, if we can't get the certificate, don't fail entirely, instead treat as a blind tunnel.
  • Add "Save and Open as Local &File" context menu
  • Enhanced File Exporter
  • Add FiddlerGotRequestHeaders and FiddlerGotResponseHeaders timers
  • Add HostList class for faster and more standardized handling of Hostnames.
  • Add "Run Filters now" to Filter's Action button.
  • Add more XML code description attributes
  • Enhanced AutoResponder
  • sTunnel field converted to property with correct accessors [Breaking change]
  • Various bugfixes

New in Fiddler 2.3.6.7 (Nov 3, 2011)

  • Various bugfixes

New in Fiddler 2.3.6.4 (Oct 5, 2011)

  • Request Cookie Inspector
  • Automate firewall exemption
  • Inspect in New Window command
  • Improved Inspectors
  • Troubleshooter for Filters on the Help menu
  • Various UI improvements
  • Various bugfixes

New in Fiddler 2.3.4.4 (Jun 23, 2011)

  • AutoUpgrader
  • Tweaks for Firefox 5
  • Assorted bugfixes

New in Fiddler 2.3.4.2 (Jun 17, 2011)

  • New features on the AutoResponder tab's context menu
  • Improved support for Apple iOS HTTPS Interception (requires add-on)
  • JSON Inspector
  • Assorted bugfixes

New in Fiddler 2.3.3.3 (Apr 25, 2011)

  • Add !dns [hostname] and !nslookup [hostname] to list DNS info to Log tab
  • Add !listen PORT [CERTHOSTNAME] to QuickExec
  • Add audio/video/font/silverlight/flash/HTTP-POST Session icons
  • Revamp a few toolbar icons
  • Enable +/- latency adjustments using AutoResponder
  • Add fiddler.ui.inspectors.request.alwaysuse and fiddler.ui.inspectors.response.alwaysuse preferences
  • Changed "Remove Un-Marked" to ignore breakpointed sessions
  • Added fiddler.ui.CtrlX.KeepMarked and fiddler.ui.CtrlX.PromptIfMoreThan # (to replace CONFIG.iPromptBeforeClearAll)
  • Add Screenshot toolbar command, including delay option
  • Delay-Create FiddlerScript file behind pref "fiddler.script.delaycreate" defaults to true
  • Add IE10 User-Agent to default rules
  • Add AlwaysFresh option to Performance menu
  • Add fiddler.requestbuilder.followredirects.max preference
  • Add actInvertSelectedSessions() with hotkey of CTRL+I
  • about:network is now a synonym for about:connectoids
  • Add support for SELECT @REQUEST.HEADER VALUE, use * to test for existence or "\*" to match on a literal star.
  • Various bugfixes

New in Fiddler 2.3.3.0 (Apr 14, 2011)

  • Improved AutoResponder with latency and per-rule editor
  • Add support for QuickLinkMenu and QuickLinkItem
  • Various bugfixes

New in Fiddler 2.3.2.7 (Apr 4, 2011)

  • Allow save/load of session content to FARX file, using compression if needed
  • Added "Open URL" to AutoResponder rules menu
  • Add "11" to Options > Font Size dropdown; enable CTRL+Plus, CTRL+Minus, CTRL+0
  • Set the mouse cursor for the interactable panels on the Status Bar
  • Support sequential requests via # token in RequestBuilder
  • Don't trim a User-Marked/Commented session
  • Add "Remove Un-Marked" to toolbar menu
  • Update _replaceVirtualHostnames to update request line for CONNECT tunnels
  • Fixed the directly-specified Proxy script handling code; added fiddler.network.gateway.DetermineInProcess preference
  • Fix AutoResponder's Connect+AlternateURL scenario
  • AutoResponder now emits detailed 404 error if session has a process ID or was generated by Fiddler
  • Update installer for Win7+ You must use "Turn Windows features on or off" in the Control Panel to install or configure Microsoft .NET Framework 2.0 SP2 for Windows 7+

New in Fiddler 2.3.2.3 (Apr 4, 2011)

  • Improved Performance
  • Improved AutoResponder
  • Improved support for Windows Phone emulator
  • Edit preferences with about:config
  • Various small improvements
  • Lots of bugfixes

New in Fiddler 2.3.1.0 (Feb 11, 2011)

  • Improved support for Windows Phone emulator
  • Editing preferences enabled in about:config

New in Fiddler 2.3.0.0 (Jul 26, 2010)

  • Various small improvements
  • Lots of bugfixes

New in Fiddler 2.2.9.6 (Jun 28, 2010)

  • Import/Export feature
  • Tons of bugfixes

New in Fiddler 2.2.8.6 (Feb 1, 2010)

  • Added -viewer switch for new "view only" mode
  • Improved Filters tab
  • Improved Request Builder
  • Improved FiddlerHook for Firefox
  • Various bugfixes

New in Fiddler 2.2.7.5 (Feb 1, 2010)

  • 64-bit support
  • Added Tools > HOSTS
  • Improved inspectors
  • Improved performance
  • Various bugfixes

New in Fiddler 2.2.4.2 (Aug 6, 2009)

  • Improved Text Encoder/Decoder
  • Improved performance
  • Improved FiddlerHook
  • Various bugfixes

New in Fiddler 2.2.2.0 (Jun 16, 2009)

  • New Fiddler toolbar
  • Improved Timeline
  • Performance and fidelity improvements
  • Include WebView inspector by default
  • Various bugfixes

New in Fiddler 2.2.1.4 (Apr 17, 2009)

  • Added FiddlerHook Firefox Extension
  • Hook all connections by default
  • Improved TextWizard
  • Improved default behavior of Find dialog
  • Allow drag/drop of files to AutoResponder to create new rules
  • Assorted bugfixes

New in Fiddler 2.1.6.2 (Jun 20, 2008)

  • Improved Fiddler Options dialog
  • ProcessID column added to Session List
  • Process Filter added to Filters tab
  • Improved Upstream Gateway support
  • Improved Performance
  • AutoStream Video option
  • Various bug fixes

New in Fiddler 2.1.2.0 (Nov 15, 2007)

  • Improved APIs for automation
  • Improved inspectors
  • Improved SimpleFilter tab
  • Improved HTTP compression efficiency
  • Improved international support
  • Improved TextWizard
  • Many bugfixes

New in Fiddler 2.1.1.1 (Oct 17, 2007)

  • New context menu Select Parent/Children/Duplicates (or hit D,C,P)
  • SimpleFilters tab now included by default
  • Improved Session Archive File format with timestamps
  • Improved streaming mode
  • Improved inspectors
  • Improved performance
  • Improved extensibility
  • Improved international support
  • Improved search box
  • Improved Header editor including header templates
  • Many bugfixes

New in Fiddler 2.0.9.0 Beta (Aug 31, 2007)

  • Improved Inspectors (WebForms/Cookies/Hex/Etc)
  • Improved Save As WebTest
  • Support for HTTPS connection reuse and upstream HTTPS gateways
  • More explicit http errors on malformed response.
  • Various bugfixes

New in Fiddler 1.1.6 (May 10, 2006)

  • Introduced support for upstream proxy autodetection and configuration scripts (http/https delivered scripts only)
  • Enhanced Find Sessions feature with new options
  • Added "Clone response" to session context menu
  • Fixed upstream NTLM/Negotiate proxy support
  • When DebugSpew is on, both requests and responses dumped to debug console in hex format
  • Change default for CaptureCONNECT to True
  • Added FiddlerObject.UI.actReloadInspectors() added to simplify inspector development
  • Fixed Save as WebTest in various ways
  • Allow userscript to override the hostname used to determine upstream IP, without changing the HTTP headers. This enables HOSTS-file type scenarios where a request should be sent to an alternative server. e.g. in your OnBeforeRequest() handler, put code like: if (oSession.host=="production.example.com") { oSession["x-overrideHost"] = "development.example.com" } Obviously, this doesn't work if you have an upstream proxy, and you have to just tweak oSession.host directly for those cases.
  • Performance and Robustness improvements