Fiddler:web Debugging Agent

Fiddler is a free proxy for recording host HTTP (S) communications, has a rich user interface, supports monitoring requests and responses, sets breakpoints, and modifies input and output data. It also supports a variety of data transformations and previews, such as extracting gzip, DEFLATE, or BZIP2 format files, and displaying pictures in the preview panel.

Fiddler can be downloaded from here free of charge, the current stable version is v2.2.0.7. The recently updated Beta v2.x version has strengthened the user interface and revised some bugs. For developers who still use the. NET Framework 1.1, Fiddler also offers a v1.3 version, except that it is no longer encouraged.

Fiddler is used primarily to view the content of a single request or response. Although it's small, it's useful when using AJAX to develop rich networking features--debugging problems, or figuring out the full story of Ajax communications

With simple but very useful timelines and visualization tools, Fiddler also supports viewing communication between multiple requests.

In addition to data monitoring and statistical analysis, Fiddler also supports setting breakpoints and modifying data for requests and responses. This is useful for testing security and data correctness.

Fiddler provides a powerful "out-of-the-box" feature, as well as a subsystem based on event scripting, which includes a script editor capable of syntactic element awareness to support extensive customization. For. NET developer, Fiddler supports the use of. NET language extensions with unique support. There are plenty of videos to help people get started quickly.

Fiddler can automatically configure the debugging agent for Ie6/ie7, and this agent is also compatible with Firefox, opera, and any applications that use the HTTP (S) protocol. For example, in Firefox, you can manually specify the agent by "menu > Properties > Network > Settings >" [1] by manually specifying the agent: 127.0.0.1, port number 8888.

Fiddler is tightly integrated with. NET, and there are many familiar tools for providing similar functionality: