F12 packet capture is used for the whole process analysis of postman interface test

One 、 Why grab a bag

From the perspective of functional testing

View hidden fields by capturing packets

Web There are many hidden fields in the form , These hidden fields generally have some special purposes , Like collecting user data , The prevention of CRSF attack , Anti crawler , And some other uses . These hidden fields are not visible on the interface , If you want to detect these fields , You have to use the bag grabbing tool .

Understand the content of the agreement through the packet capture tool

Facilitate interface and performance testing

Performance testing , Performance testing is actually a large number of simulated user requests , So we must know the content and characteristics of the agreement in the request , To better simulate user requests , Packet capture tools are needed to analyze the protocol ; Interface test , In interface testing , Although we try our best to have perfect interface documents . But in many cases, interface documents cannot cover all situations , Or because the document lags behind , During the interface test , We also need to use the packet capture tool to assist us in interface testing .
 

You need to use the bag grabbing tool , Check data encryption

Security testing , We need to check whether sensitive data is encrypted during transmission , It also needs the help of bag grabbing tools to check .

Front and rear end of treatment bug The dispute of belonging

Before we submit bug When , Front ends often appear （ Client presentation ） Back end （ The logic of the server ） Controversy , Then you can use the packet capture tool , Is it really the problem of data transmission or the problem of front-end display . If there's a problem with the captured data , So it's usually the back-end problem ; If the captured data is correct , So basically, it can be concluded that the problem is the front-end display .
 

Through packet capturing analysis

Can better understand the whole system

Often use packet capture tools to assist in testing , You can have a good understanding of the whole system , For example, the relationship between the front and back of the data transmission process , And the structure of the whole system . Especially for the products of current micro Service Architecture , Capturing packets can better sort out and grasp the relationship between various services of the whole system , Greatly increase the coverage of the test . In addition, it can improve the understanding of code 、HTTP Understanding of protocol knowledge .
 

Two 、 How to grab a bag

Common packet capture tools are Fiddler、wireshark、Charles And the browser comes with F12 And other tools . So here's how to use Browser comes with F12 To grab the bag .

* The first 1 Step ： After opening the browser , Press F12, Select the network -- Click the setup button -- Check continuous recording

* The first 2 Step ： Operate on the browser , You can see in the network HTTP Request information （ Login operation ）

* The first 3 Step ： Find the requested information for the operation （ Login operation ）

* The first 4 Step ： Get the four elements of the request , Used for interface testing

1- Request address ：

2- Request method ：post

3- Request parameters ：

{"logo":"HC","username":"wuye_kemi","passwd":"xxxx","validateCode":"LEMON","errorInfo":""}

• username： User name when logging in

• passwd: Password at login

• validateCode： Login verification code

4- In response to the results ：

{"userName":"wuye_kemi","userId":"302021110504836175","token":"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJqY"}

3、 ... and 、Postman Interface test practice

adopt F12 After capturing the packet, we get the relevant interface information , Next we can use postman Interface tool to test the interface .

Put the request address in turn 、 Request mode 、 Request parameter filling postman In the tools , Click on Send send out , Then check the response result and the packet capture response result . In this way, a simple interface debugging is completed .

Four 、 summary

If you want to test the interface by capturing packets , Need to have a certain network protocol Foundation , These foundations allow you to quickly find request and interface information .

The second is in the process of interface testing , We'd better communicate with developers , Because they know more about the meaning of each parameter and type constraints , Want a more comprehensive test interface , You can organize the packet capture information into documents , And communicate with developers to improve documents .

The standard test flow is to design use cases and execute interfaces with interface documents .

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