Fiddler Everywhere: download ældre versioner

New
- Add support for custom inspectors built for Fiddler Classic on Windows.
- Add support for GPT-6 models in the Chat Assistant.

Fixed
- Sanitization does not consistently mask nested JSON and XML values.
- Removed sanitization keywords continue to mask matching data until the application restarts.
- The Do Not Show rule action incorrectly changes gateway proxy behavior.
- Updated third-party dependencies to address potential security vulnerabilities.

New
- Added scripting functionality.
- Added host remapping functionality.

Fixed
- Warning for unsaved filter appears in Snapshots when closing the application.
- Fixed CVE-2026-86158: Missing Authentication in the local .NET backend of Progress Telerik Fiddler Everywhere.
- Fixed CVE-2026-86157: Exposure of Privileged IPC Functionality in Progress Telerik Fiddler Everywhere.
- Updated third-party dependencies to address potential security vulnerabilities.

New
- Group sessions per domain/application.
- Add QUERY method in Composer.
- Updated AppImage integration for Linux.
- Option to copy header name only in inspectors.

Fixed
- App crashes on startup when network access is blocked.
- Duplicate VPN bypass entries when host contains multiple endpoints.
- GRPC reflection fails to resolve for some sessions.
- Stop loading animation if OS animations are disabled.
- Close button is missing on some notifications.
- Updated third-party dependencies to address potential security vulnerabilities.

Fixed
- Set the MCP server name to Fiddler for improved client integration and discoverability.
- Updated the list of supported OpenAI models available in Debugging Assistant integrations.

New
- Added a new Agent Inspector for viewing agent messages, tool calls, model details, cost, and latency.
- Added caching recommendations for Agent Cache to help reduce latency and token usage for expensive agent calls.
- Added an MCP traffic capture tool that automatically captures traffic only from applications launched from the current terminal session.
- Added one-click MCP setup for supported IDEs and coding agents, making it easier to connect Fiddler without manual configuration.
- Added a new Protobuf inspector.

Fixed
- Updated the MCP Setup Skill.
- Updated the MCP core library.
- Updated the list of models supported in the Debugging Assistant setup.
- Updates for Windows Network Driver.
- Updated third-party dependencies to mitigate potential security vulnerabilities.

New
- Expose caching of agent calls through the Fiddler MCP.

Fixed
- MCP get_sessions_details returns compressed body when sanitization is used.
- Requests to bedrock-runtime are not displayed in Agent Calls tab.
- Certificate errors are shown in application logs when certificate is trusted
- After Add to Snapshot, the Streaming messages are not visible.
- SingalR lost connection leads to multple Unexpected Errors.
- Mark session in Copper colour doesn't work.
- Update the list of available models in Assistant settings tab.
- Updated third-party dependencies to mitigate potential security vulnerabilities.

Fixed
- The MCP get_sessions tool is failing with agents that require object-root structured responses.
- The MCP tool get_session_details does not properly return request & response bodies for POST requests.

New
- Introduce new API endpoint for MCP API key generation.

Fixed
- The empty state of the Agent Calls tab does not provide clear guidance.

Fixed
- Agent Cache response returned comment shows wrong origin session ID.
- Updated third-party dependencies to mitigate potential security vulnerabilities.

New
- Introduced Agent Cache functionality, enabling users to capture and selectively cache real Agent request/response pairs.

Fixed
- Autosave could not be disabled when there is quota limiting the functionality.
- Debugging Assistant continued to function after the Fiddler Everywhere trial had expired.
- Email addresses were duplicated when separated by spaces in Share dialogs.
- Upgraded the application’s core backend runtime to the latest supported version.
- Updated third-party dependencies to mitigate potential security vulnerabilities.

Fixed
- JSON format and tables not displayed correctly in Debugging Assistant.
- Upgraded the application’s core frontend technologies and UI component libraries to latest supported versions.
- Update third-party dependencies to mitigate potential security vulnerabilities.

New
- Added Debugging Assistant, enabling users to connect their preferred LLM model and enhance HTTP traffic analysis and debugging workflows.
- Added managed application configuration allowing administrators to control Debugging Assistant access.

Fixed
- It was possible to configure the same reverse proxy port multiple times through MCP.
- SSE over HTTP/1.1 fails the entire session when unchunking is unsuccessful.
- Update third-party dependencies to mitigate potential security vulnerabilities.

New
- Added Fiddler Everywhere MCP server, enabling users to leverage Fiddler’s capabilities inside their AI-powered IDEs.
- Added a data sanitization tool that lets users remove sensitive information from traffic before saving, exporting or sharing with the MCP server.
- Added managed application configuration allowing administrators to control MCP server access.
- Added a Save button to the AutoSave dialog for easier state changes.
Fixed
- Open Autosave Dialog shortcut can open the dialog multiple times

New
- Add a Save button to the Reverse Proxy and Network Capture dialogs for easier state changes

Fixed
- Compact view improvements in Live Traffic grid
- Body inspector scrolled to top while reviewing a streaming session that is still in progress
- Best inspector not automatically selected when switching between sessions with different body types
- Update third-party dependencies to mitigate potential security vulnerabilities

New
- Show streaming responses in real time in the body inspectors
- Group multiple error messages into a single notification for better user experience

Fixed
- Folders tree selection in save resources dialog is in the wrong place
- Toolbar buttons flicker when application window is resized for small monitors
- Application window not visible when its previous location is outside of the screen boundaries

New
- Add compact tables view for session list, composer and inspectors to reduce row height and fit more data on the screen. Go to Settings > Appearance to switch between Default and Compact view.
- Add support for parsing messages in server-sent events (SSE) sessions using HTTP/1.1

Fixed
- Error "Invalid session id/session source id" displayed when Fiddler works in the background
- Email validation requires additional clicks when sharing resources with other users
- The content-type header in composer requests gets duplicated in some cases
- Scrolling inspectors view with small app window sometimes hides the session body contents
- Update third-party dependencies to mitigate potential security vulnerabilities

New
- [Beta feature] Added network capture mode for Windows
- Added support for Reverse proxy
- Allow the Fiddler CA to be stored in the system keychain on macOS

Fixed
- Update third-party dependencies to mitigate potential security vulnerabilities

New
- Allow self-generated CONNECT tunnels to use HTTP2
- Add new policy "DisableVpnHostBypass" to disable automatic VPN detection

Fixed
- Entering emails when sharing data with others only works if Enter key is pressed after typing
- Dragging rules to reorder them does not work
- Changes through App Configuration for DefaultNetworkCaptureList are not applied
- "DefaultBypassList" policy on macOS does not work correctly when Cisco VPN client is installed
- Application crash on startup when running on Fedora 41 or newer versions
- Rule manual response will accept invalid HTTP status line without correcting it
- Overview tab can show invalid timings when loading data from saved snapshots
- App menu can show invalid items after changing the user account
- Update third-party dependencies to mitigate potential security vulnerabilities

New
- Allow using custom CA certificates
- Add live or saved sessions to existing snapshots

Fixed
- HTTP 407 errors returned from Fiddler proxy when using some third party services like Zscaler
- MessagePack request body not decoded
- Update third-party dependencies to mitigate potential security vulnerabilities

New
- Add new tools menu with Advanced Replay, Decode Value and AutoSave features
- Add support for AutoSave to automatically and periodically save live session data
- Add menu option to trust Fiddler CA in the Windows Machine Certificate Store
- Automatically enable HTTPS capturing after Fiddler CA certificate is trusted
- Show a warning on macOS when enabling system proxy if Cisco AnyConnect VPN is running and add the VPN host to the bypass list

Fixed
- Sessions used for automatic authentication are not marked as closed after they are done

New
- Decode content popup is now opened in a separate window
- Added option for automatic Windows authentication including Kerberos and NTLM
- Updated title bar UI

Fixed
- Some headers may become hidden in the Composer tab when there are many values

New
- Show a dialog when Fiddler cannot set a proxy for the current user on Windows

Fixed
- Endless loader in body inspector for empty chunked response
- Request form data not shown correctly in inspector when content encoding is set in request headers
- When a rule's manual response starts with an invalid symbol the whole response text is deleted
- Adding a second manual response action to a rule overwrites unsaved changes in other manual response actions
- Some rules keyboard shortcuts are triggered from the Composer URL address bar
- Update third-party dependencies to mitigate potential security vulnerabilities
- Minor text fixes

New
- Redesigned keyboard shortcuts for most used user flows and new keyboard shortcuts dialog
- Redesigned Sizes view provides more detailed information for single or multiple selected sessions

Fixed
- Moving the Session Selection in Live Traffic Grid, Snapshot Tree and Rules List should not require Enter
- Unable to install on clean Windows machine when starting the installer from Downloads folder
- Add information in Messages inspector that server-sent events over HTTP/1.1 cannot be displayed
- Show total sum in Timings table
- When session is deleted clear the content from inspectors too
- Cannot scroll to the bottom of the Columns dropdown

New
- Rules now match requests before they're sent and responses before they're received for more precise traffic handling
- Updated rule editor UI now shows the exact match time, flags when a rule won't execute as expected, and provides suggestions to fix it
- Rule actions can now be reordered using drag and drop
- Text areas in the rule editor window automatically expand to fit their content
- Added zoom control shortcuts to rules editor dialog
- Updated UI and expandable text areas for the advanced filter dialog

Fixed
- Selecting parent or child requests in the live traffic grid does not update the sessions list
- Error when trying to accept EULA
- Rules with manual response actions will sometimes lose their response body after saving

New
- Add a settings menu to the Timings view in the Overview Tab
- Add an Auth Inspector tab for requests
- Replace HTTP Version and TLS version match conditions with separate client and server values for rules and filters

Fixed
- Improved performance in the Inspectors tab when reviewing captured sessions
- Application fails to open on Windows due to invalid COMSPEC environment variable
- Some macOS and Linux systems generate numerous warnings and slow down capture when resolving port numbers to process names
- Dialog for unsaved changes appeared unnecessarily when closing the rules window without making any changes
- Update third-party dependencies to mitigate potential security vulnerabilities

New
- Import settings, filters, and rules from Fiddler Classic to Fiddler Everywhere through a wizard
- Display an "Unsaved Changes" dialog when closing the Rule Builder window

Fixed
- Update third-party dependencies to mitigate potential security vulnerabilities

Fixed
- Application does not load on specific Windows OS configurations
- HEX inspector selection and search have inconsistent behavior
- The status bar covers the last row of inspector data when viewing large gRPC messages
- Rule Builder autocomplete text and buttons can overlap
- Rule Builder dialog closes without saving changes if Esc key is clicked
- "Update Header" and "Update Status Code" rule actions do not execute for already captured sessions
- Timestamps tooltips are displayed to the left of the text
- Opened tabs state is not always persisted when app is closed
- Update third party dependencies to mitigate potential security vulnerabilities

New
- Show a warning that not all timing details are available in the Overview inspector when working with older snapshots
- Move Rules builder dialog to a separate detached window
- Add a group with predefined Rules templates covering common usage cases

Fixed
- Filter conditions with "Does not contain" comparison do not work when the checked field is empty
- UI fixes for new timings view in Overview inspector
- Unexpected error in application logs when login fails
- Update third-party dependencies to mitigate security issues

New
- Show notification when information is copied from the timings timeline

Fixed
- Session times in overview tab show inconsistent values for some timings like HTTPS handshakes
- Wrong settings tab opened when missing Protobuf warning message is clicked on a gRPC session
- Update third-party dependencies to mitigate security issues

New
- Redesigned Timings view provides more detailed information for single or multiple selected sessions
- Protobuf is now the default message inspector for gRPC sessions
- A notification appears if a global proxy policy is applied to the preconfigured Fiddler browser for Chrome or Edge
- The application status bar now shows the number of active session breakpoints
- Added support for capturing traffic from Microsoft Edge WebView2 apps launched through Fiddler's terminal

Fixed
- Missing Hex inspector for SSE session messages
- Some SSE sessions (like ChatGPT conversations) are not being captured correctly
- An error occurs when closing WebSocket tunnels
- Multiple dialogs are opened when certain keyboard shortcuts are used
- The preconfigured browser crashes shortly after launch
- Deleting a session stopped at a breakpoint does not resume its execution
- Update third-party dependencies to mitigate security issues

New
- Allow admins to configure network capture settings through management systems on macOS

New
- Allow admins to to configure app settings through policy management systems on Windows and macOS
- Add .pkg file as a new package distribution option for macOS
- Open .farx (exported rules) file automatically with Fiddler Everywhere

Fixed
- Login error screen can be accidentally closed leaving the application window blank
- When comparing sessions, differences in HTTP/2 pseudo-headers are not highlighted in the headers tab
- Update third-party dependencies to mitigate security issues

New
- Highlight differences in Inspectors tab when comparing sessions
- Updated information about the required browser when downloading the CA on iOS device
- Add a new Certificate menu with options for trusting the Fiddler CA
- Add a full timestamp to the default file name when saving sessions

Fixed
- Stop trying to detect Windows automatic proxy configuration for each session if the first attempt returns no PAC file
- Errors displayed in the application after using advanced replay options and a change occurs in the computer network adapters
- Confirmation dialog when deleting rules is delayed when trying to delete a large amount of rules
- Update third-party dependencies to mitigate security issues