The Fiddler tool helps you debug web applications by capturing network traffic between the Internet and test computers. The tool enables you to inspect incoming and outgoing data to monitor and modify requests and responses before the browser receives them. Fiddler also includes a powerful event-based scripting subsystem, which you can extend by using any .NET Framework language.
Fiddler and the HTTP replay options can help you troubleshoot client-side issues with web applications by making an offline copy of the test site. With these tools, you can create offline images of the browsing experience and then package and analyze the results to obtain more detailed debug information.
The proxy basically sits between the Windows WinINET interface and the internet. WinInet is high-level API to work with HTTP, FTP, and Gopher protocols.
Current versions of Internet Explorer, Google Chrome, Apple Safari, and Opera all automatically use Fiddler when Fiddler is configured to Capture Traffic.
You can download Fiddler at here.
In addition, Fiddler helps you decrypt HTTPs traffic and display and modify the requests that would otherwise be inscrutable to observers on the network using a man-in-the-middle decryption technique.
"Text Wizard" tool in the Fiddler lets you process text in a variety of formats. You can encode/decode data using: Base64, URLEncode, HexEncod, JS string, HTML Encode, UTF-7, Deflated SAML.
To enable HTTPS traffic decryption:
Click Tools > Fiddler Options > HTTPS.
To skip traffic decryption for a specific host
Type the hostname in the Skip Decryption.
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