2024-07-12
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Fiddler is a powerful network debugging tool that can record, inspect, modify and resend all HTTP/HTTPS traffic passing through a computer. This article will introduce the installation, configuration and usage tips of Fiddler in detail to help developers and testers better understand network requests and responses.
Fiddler is a free network debugging tool developed by Telerik and is widely used in Web development and testing.
accessTelerik official websiteDownload the latest version of Fiddler and follow the prompts to complete the installation.
Open Fiddler and it will automatically start capturing all HTTP/HTTPS traffic passing through your computer.
In Fiddler's main interface, you can see all captured network requests and responses, arranged in chronological order.
Use the filters on the toolbar to quickly filter sessions of a specific type, such as only showing image requests, error requests, etc.
Right-click the request line and select "Edit" to modify the request URL, method, header information, or body.
Right-click the request line, select "Breakpoints", set a breakpoint, and Fiddler will pause before the request is sent.
Right-click the request line and select "Resend" to modify the parameters and resend the request.
In Fiddler's "Tools" > "Options" > "HTTPS", check "Capture HTTPS CONNECTs" and "Decrypt HTTPS traffic".
Install and trust Fiddler's root certificate in order to capture HTTPS traffic.
Use Fiddler's "Timeline" view to analyze the response time of network requests and identify performance bottlenecks.
By using Fiddler's scripting function, you can implement automated testing, custom processing logic, etc.
Fiddler is a powerful and easy-to-use network debugging tool. Through the detailed introduction in this article, I hope that readers can master the basic usage of Fiddler and give full play to its powerful functions in actual work.
First, start the Fiddler tool. Fiddler listens to port 8888 by default.Tools > Options > Connectionsto confirm or change.
Make sure your operating system or specific application's proxy settings point to Fiddler. Typically this is set to:
127.0.0.18888Initiate an interface request in a browser or other client. The request will be captured by Fiddler and displayed on the main interface of Fiddler.
Inspectors > Request, which displays detailed information of the request, including HTTP method, URL, request header, request body, etc.Inspectors > Response, which shows the server's response, including status code, response header, response body, etc.If you need to test different request parameters or header information, you can select the session and thenRequestAfter modification, you can use the right-click menuResendto resend the request.
In some testing scenarios, you may need to simulate server responses.ResponseModify the response content in the tab page and passResendResend the modified response to the client.
Fiddler allows you to set breakpoints at the request or response stage. Select the session and clickBreak on RequestorBreak on Responsebutton. As the request or response passes through, Fiddler will pause execution, allowing you to view or modify the request/response in real time.
If the interface is HTTPS, make sureTools > Options > HTTPSCheckedCapture HTTPS CONNECTsandDecrypt HTTPS traffic. Also, make sure the client trusts Fiddler's root certificate.
You can save a specific session for later testing or to share with others. Right-click the session and selectSave > Selected Sessions…and select the saving format and location.
Fiddler supports automated testing using scripts.QuickExecorCustomize Rules, you can write scripts to automatically handle sessions.
Using FiddlerTimelineFunction, you can perform performance analysis on interface requests and view request and response times.
After the test is completed, remember to turn off the Fiddler proxy in the proxy settings to avoid affecting normal network access.
Using Fiddler for interface testing can greatly improve testing efficiency, help developers quickly locate problems and optimize interface performance. Remember to make full use of the various functions and options provided by Fiddler during use.
First, make sure the Fiddler tool is started.
In Fiddler, you can set breakpoints in the following ways:
Rules > Automatic BreakpointsCheckBefore requests。Rules > Automatic BreakpointsCheckAfter responses。Breakpoints > set URL, enter a specific URL or use wildcards.Make sure your browser or application's proxy settings point to Fiddler so that the traffic can be captured.
Sends a request in the browser or application. If a breakpoint is set, the request will pause before it is sent or before it returns.
After you request a pause, you canInspectors > RequestView and modify request details, including:
If you set a responsive breakpoint, you canInspectors > ResponseView and modify the details of the response, including:
After modifying a request or response, clickRunbutton (or press F10), Fiddler will continue executing the request or response.
If necessary, right-click the session and selectResendto send the modified request.
After debugging is complete, remember toRules > Automatic BreakpointsUncheck the corresponding breakpoint option in to avoid breakpoints for all requests.
Fiddler allows the use ofExecute JavaScriptorExecute C#command to execute a script, which can automatically perform some actions when a request or response is paused.
FiddlerScript allows you to write JavaScript code that will be executed on each session handle and can be used to modify requests or responses.
You can save debugging sessions or export them as HTML reports for sharing or archiving.
By using Fiddler's breakpoint debugging function, you can gain a deeper understanding of and control the process of network requests, which is very helpful for development and testing.
First, open the Fiddler tool. Make sure Fiddler is running, as it will capture all traffic going through the proxy.
Make sure your browser or application is set up to proxy through Fiddler. Typically this is set up as:
127.0.0.18888In Fiddler, click Rules menu and selectPerformance > Simulate Modem Speeds。
In the dialog box that pops up, check Simulate low bandwidth andSimulate high latency option. This will simulate a low bandwidth and high latency network environment.
After the settings are completed, click OK Save Settings.
Now, when you make requests through your browser or application, Fiddler will simulate the specified network conditions.
Observe the performance of the application in a weak network environment, check the loading time, response speed, etc.
Adjust the simulated network parameters as needed to test application performance under different network conditions.
After the test is completed, you can Rules > Performance UncheckSimulate Modem Speedsto restore normal network speed.
Record test results and perform analysis and optimization based on observed issues.
By using Fiddler's weak network simulation function, you can evaluate the behavior of the application under different network conditions during the development and testing phases, thereby optimizing the user experience.
I have devoted myself to the research of technology for more than 30 years. I am proficient in various languages such as Java, Linux, JavaScript, PHP, CSS, etc. I have made many contributions in the field of open source. I have established a developer documentation site to share some problems in technology development for everyone to read.
