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This article focuses on "how to use the Web debugging agent tool Fiddler", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use the Web debugging agent tool Fiddler.

Brief introduction

Fiddler is a Web debugging agent tool that records all HTTP (S) communications between the computer and the Internet. Check traffic, set breakpoints, and edit action requests / responses.

The Fiddler Web debugger can record, check, and debug traffic from any browser.

The Fiddler Web debugger can debug Web traffic from any Windows-based PC,Mac or Linux system as well as mobile devices.

Function introduction

Web debugging: you can decrypt and decompress Web sessions and analyze session data.

Web session operation

Simulate raw HTTP traffic: Fiddler's automatic responder is an advanced feature that allows the Web debug agent to respond on behalf of the Web server. The automatic responder allows you to create a rule that automatically returns a response to a request by returning a previously captured response without requesting the server.

Build HTTP requests: using the Fiddler Web debugger, you can manually build and send HTTP,HTTPS and FTP requests. Alternatively, you can choose to clone the session from the Web session list to the Composer tab by dragging and dropping. Click the execute button to send the request to the server.

Set breakpoints: modify the session by setting breakpoints after / before each request or response or by adding custom breakpoints.

You can also use the quick exec box to create simple breakpoints for situations where a particular URL is encountered. Fiddler then pauses the processing of the session and allows manual changes to the request and response. You can also select the response that will be returned automatically.

HTTP/HTTPS traffic record

Filter captured traffic: Fiddler supports a variety of filters, such as "hide the session", "highlight interesting traffic", "breakpoints to operate on the session", "block traffic from being sent", etc., which can save a lot of time and effort.

Capture all HTTP traffic: Fiddler can capture HTTP traffic from all locally running processes and all HTTP traffic entering the Fiddler agent.

Safety testing

Fiddler security add-ons: Fiddler provides some security test components, such as Watcher-developed by the Casaba security team, Watcher observes the browser's interaction with your site; x5s; intruder21; Ammonite, and so on.

Automatically perform SSL decryption: you can set the decryption of HTTP requests and responses in different situations.

Performance testing

The timeline of the HTTP request Timeline:Fiddler shows the start time and duration of each selected session-knowing at a glance how the application uses the network. You can view the "waterfall diagram" between 1 and 250 selected sessions, which is useful for performance analysis and understanding the relationship between requests. You can easily identify slow requests (long bars), bottlenecks that block requests due to connection restrictions (the ladder group of requests), and unnecessarily close connections (red X icon).

Analyze the performance of Web applications: check the Statistics tab of Fiddler to see the overall performance metrics of the application. You can select all sessions to view comprehensive statistics such as the total number of requests broken down by content type or pie chart and the number of bytes sent and received.

Request and response simulation: simulate or modify requests and responses on any website. This is a convenient way to change the request and response of a test site without changing the code.

At this point, I believe you have a deeper understanding of "how to use the Web debugging agent tool Fiddler". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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