Use of fiddler packet capturing tool

One 、 Usurp Change data

1、Rulers –Automatic Breakpoints—Before Requests

Grab the requested packet modification data , To set up before requests, Modifying data is requesting modification . First set up , Then grab the bag , Modified to complete , Click on run to completion, The returned request should also be clicked run to completion, To display the page .

for example ： New schools , The name of the school is 888, Change it to 999

Go to the packet capturing interface to change the data

Refresh the browser , Data change complete

2、Rulers –Automatic Breakpoints—After Responses

Modify the returned data , Set up After Responses, Decode first , Modify the data in the response , And then click run to completion.

for example ： take title The enrollment entry system is changed to ： Tiandao enrollment

Two 、 Catch APP My bag

1、 Make sure your phone and computer are on the same LAN （ Cell phone connected to computer WiFi）

Check the computer IP

Turn on your phone and make changes

ipconfig

4、 Operate on a mobile phone APP, use fiddler Grab the bag

Be careful ：

1. In the mobile phone or mobile terminal APP When testing the interface , You need to get the interface documentation from the developer , The interface documentation should include a complete functional interface 、 Interface request mode 、 Interface request URL、 Interface request parameters 、 Interface return parameters . If the current project has no interface document , You can use fiddler Yes APP Grab the bag to confirm .
2. On the phone, right APP To operate , And then in Fiddler The corresponding network interaction information can be captured in
3. （ The interaction of multiple interfaces may be designed in a function ）. The interface request mode can be seen in the captured information 、 Interface request URL、 Interface request parameters 、 Interface return parameters .
4. because fiddler The principle of packet grabbing is through agents , So the tested terminal needs to be installed fiddler Our computers are in the same LAN .

3、 ... and 、 Simulated weak network test

1. Why do weak network tests ？ Assist in developing and locating weak network problems , Make sure App stay 2G、3G、4G In all kinds of network environments , Every page can be opened , Can jump normally and complete the complete payment process transfer ,、 Loading and unloading process . Don't pop up easily “ Unable to connect to the network ”,“ Network connection timeout ”,“ The system is busy ” Etc .

2. stay Fiddler There are weak network tests . We can go through Fiddler Conduct weak network test . Weak network testing is to test by controlling the speed of uploading and downloading

3.Ctrl+F lookup . Jump out of upload and download speed . Adjust .Fiddler The speed limit is realized in the form of network delay , Network latency * Network speed = Number of bytes transferred .

Delay sends by 300ms per KB uploaded. Very clear , Delay sending every upload KB 300 millisecond . namely 1kb/0.3s（10kb/3s）

4. After the modification is completed , Press ctrl+s Save script , Running the script , You can limit the Internet speed . Here's the picture

5. Then you can open the web page to view .

Four 、 Grab HTTPS My bag

1. http The protocol port is 80.https The protocol port is 443, They use completely different transport protocols .http The link of the agreement is stateless ;https Agreement is made ssl+http The protocol can be constructed for encrypted transmission , Network protocol for identity authentication , He compared http Security agreement .
2. http It's the hypertext transfer protocol , The message is transmitted in clear text . So catch http Relatively easy .
3. https It is safe ssl Encrypted transport protocol .https The agreement needs to reach ca Apply for a certificate .

step ：

First export the certificate to the desktop

Need to download first fiddlercertmaker  function  

Open Google browser   Set up

Last , Open a web page in a browser , use fiddler Grab the bag

Error reporting solution ：

1、 Unable to download certificate

install fiddlercertmaker

Check whether the version of the packet capturing tool is the latest

2、 When modifying the response data, there is a blank

First click decode , Modify data again , Then click run to completion

3、fiddler Initiate error reporting