Fiddler is an HTTP debugging proxy for developers and testers investigating web applications. It records HTTP traffic between a computer and the Internet, then presents requests and responses for inspection. Users can review headers, cookies, and returned content, set breakpoints, and modify incoming or outgoing data. Its JScript .NET event-based scripting subsystem supports custom HTTP debugging tasks. Fiddler is freeware for Windows.

Fiddler is an HTTP debugging proxy for developers and testers who need to see how a web browser or application communicates with online services. It sits between a computer and the Internet, recording HTTP traffic so requests and responses can be examined in one place. Rather than showing every kind of network packet, it focuses on HTTP, making web exchanges easier to follow when investigating application behavior, unexpected content, or slow page loads.

The captured sessions provide a practical view of the information moving in both directions. Developers can inspect request and response details, including headers, cookies, and returned content, to check what an application sends and how a server answers. This can help identify missing or incorrect values, understand which cookies accompany a request, and see whether downloaded resources are marked for caching. Reviewing a sequence of exchanges also helps trace where a web workflow behaves differently than expected.

Fiddler can pause traffic at breakpoints, allowing a developer to examine a request or response before it continues. Incoming or outgoing data can be changed during this process, which is useful for testing how an application handles altered server replies or modified requests without first changing the application itself. Its event-based scripting subsystem, written in JScript .NET, extends this workflow with custom handling for HTTP debugging tasks. The combination of session inspection, breakpoints, edits, and scripts supports both hands-on troubleshooting and repeatable analysis.

Typical uses include diagnosing web application bugs, investigating performance bottlenecks, checking cookie behavior, and verifying how a client and server exchange data. Testers can use the proxy to observe traffic generated by a browser or another HTTP-capable program, while developers can reproduce and examine individual exchanges. Because it concentrates on HTTP traffic rather than general network activity, Fiddler presents a narrower view than packet-analysis tools such as NetMon and is oriented toward web debugging.

Fiddler is freeware and is written in C# using the Microsoft .NET Framework. It is available for Windows, including Windows 7, and was developed as an unsupported PowerToy for Internet Explorer. Its HTTP proxy approach makes it most useful when the traffic to be investigated is accessible through the computer on which Fiddler is running. It is a focused diagnostic utility rather than a general-purpose network monitor.

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