PuTTY Portable can run from a cloud folder, external drive, or local folder without installing into Windows. It's even better with the PortableApps.com Platform for easy installs and automatic updates. Platform 17.1.1 (Sep 09, 2020). In the Fiddler Options screen, Select the option “Allow remote computers to connect”. Step 3: Restart Fiddler. You will see an alert message from Windows Firewall. Click the “Allow access” button. This will add the port number (shown the above screenshot) and the fiddler.exe to the Windows Firewall exception. Fiddler is freeware and can debug traffic from virtually any application, including Internet Explorer, Mozilla Firefox, Opera, and thousands more. Fiddler 2 has replaced Fiddler 1.x. Fiddler 2 supports debugging HTTPS traffic, a richer extensibility model, and can by installed side-by-side with Fiddler 1.x if desired.
Configure Fiddler as Reverse Proxy
To use this method, the hostname for the request to reroute must be 127.0.0.1:8888, localhost:8888, [::1]:8888, or the machine's NETBIOS hostname on port 8888.
- Click Tools > Fiddler Options. Ensure Allow remote clients to connect is checked.
- Contexts 3 6 1 – fast window switcher kit. Close Fiddler.
- Start REGEDIT.
- Create a new DWORD named ReverseProxyForPort inside HKEY_CURRENT_USERSOFTWAREMicrosoftFiddler2.
- Set the DWORD to the local port where Fiddler will re-route inbound traffic (usually port 80 for a standard HTTP server).
- Restart Fiddler.
- In a browser, go to http://127.0.0.1:8888.
Write a FiddlerScript Rule
- Click Tools > Fiddler Options. Ensure Allow remote clients to connect is checked.
- Click Tools > Fiddler Options, and ensure the 'Allow remote clients to connect' checkbox is checked.
- Restart Fiddler if prompted.
- Click Rules > Customize Rules.
- Inside the OnBeforeRequest handler*, add a new line of code:
- Using a browser on the client machine, go to http://webserver:8888.
Configure Fiddler to Listen to Client Application Target Port
- Reconfigure your target server to listen on a different port. For example, if a web server runs on port 80, reconfigure it to run on port 81.
- Click Tools > Fiddler Options...
- Click Connections.
- Type the client's target port number next to Fiddler listens to port:
- Configure Fiddler as a reverse proxy or write a FiddlerScript Rule to re-route traffic to the target server's new port (described above).
Freeware
Windows/macOS
1.2 MB
147,942
Fiddler allows you to inspect traffic, set breakpoints, and 'fiddle' with incoming or outgoing data. Fiddler includes a powerful event-based scripting subsystem, and can be extended using any .NET language.
Fiddler is freeware and can debug traffic from virtually any application that supports a proxy, including Internet Explorer, Google Chrome, Apple Safari, Mozilla Firefox, Opera, and thousands more. You can also debug traffic from popular devices like Windows Phone, iPod/iPad, and others.
Fiddler Portable Bluetooth Speaker
Web Session Manipulation
Edit web sessions easily:just set a breakpoint to pause the processing of the session and permit alteration of the request/response. Compose your own HTTP requests and run them through Fiddler.
Performance Testing
Fiddler lets you see the “total page weight,” HTTP caching and compression at a glance. Isolate performance bottlenecks with rules such as “Flag any uncompressed responses larger than 25kb.”
Fiddler Portable Air Conditioner
Customizable Free Tool
Benefit from a rich extensibility model, ranging from simple FiddlerScript to powerful extensions which can be developed using any .NET language.
See full list of ready-made add-ons.
See full list of ready-made add-ons.
Security Testing
Decrypt HTTPS traffic and display and modify web application requests using a man-in-the-middle decryption technique. Configure Fiddler to decrypt all traffic, or only specific sessions.
HTTP/HTTPS Traffic Recording
Use Fiddler to log all HTTP(S) traffic between your computer and the Internet. Debug traffic from virtually any application that supports a proxy (IE, Chrome, Safari, Firefox, Opera and more).
Web Debugging
Debug traffic from PC, Mac or Linux systems and mobile (iOS and Android) devices. Ensure the proper cookies, headers and cache directives are transferred between the client and server. Supports any framework, including .NET, Java, Ruby, etc.
What's New:
- Add Packet Capture Import
- Enhanced Composer
- Enhanced AutoResponder
- Enhanced Protocol Violation detection
- Improved WebView
- Add registry-fallback to EnableLoopback