It smells good. Since I used Charles, Fiddler has been completely uninstalled by me

Doing client / When testing the server , It is often necessary to capture and analyze the operation of the client , Check whether the request and response data meet the expectations . Therefore, the ability of capturing packages is a necessary skill for software testing practitioners . At present, the commonly used bag capturing tools in the industry mainly include Fiddler and Charles. This article focuses on the following Charles Basic use of .

Charles It's a support HTTP Network agent software for agent and packet capture . The browser or APP adopt Charles When accessing the network , It can record and display all the messages sent 、 Data received .

01 install

Charles rely on Java Running environment , This machine needs to be configured first jdk（ The specific installation configuration is slightly ）

visit Charles Official website ：https://www.charlesproxy.com/

Click the download button on the right , You can download the latest version Charles, stay Windows Double click to install . The latest version is 4.6.2.

02web Grab the bag

By default , start-up Charles after , You can catch it automatically Chrome browser 、Firefox Browser package , If you can't catch , Please check Charles Whether the agent switch is checked in the “Windows Proxy/Mac Proxy”
03 Common functions

Charles There are two views to view packets , Respectively called “Structure” and “Sequence”

Structure View to classify network requests by domain name accessed
Sequence View sorts network requests by access time

04 Request filtering

By default Charles Will grab all packets , And show it in the request list . But most of the time , We only have a relationship ip Or a package under a domain name Charles Filters are provided , Help us show / Exclude specified HTTP request .

Charles There are two ways to implement request filtering ：

Method 1 ：

Below the request list Filter It can realize simple filtering function , Enter keywords to filter out the corresponding URL
Method 2 ：

menu bar “Proxy-Recording Settings” in , Set up include（ contain ） and exclude（ exclude ）, You can only display or not display the specified url
05 Weak network test

and Fiddler equally ,Charles It also provides the function of weak network simulation , Test browser /APP Usage under weak network conditions .

In the menu bar “Proxy”–>“Throttle Setting” in ,Charles Built in different network modes ：56kbps、256kbps … 3G、4G etc. , To simulate different weak network effects . It can also be modified manually Download and Upload Value , Simulate different speeds .

It should be noted that , The network rate value here , The unit is bps, Corresponding to the commonly used byte/s, You need to divide by 8, As shown in figure of 4096kbps, For the actual 512kb
06 request / Response breakpoint

If you want to intercept a request , Modify the parameters of the request . Or modify the value in a request response , have access to Charles The breakpoint function of .

In the request list , Choose one URL, Right click on the “Breakpoints”, This request is set by default + Response breakpoint . When performing the specified operation ,Charles Will intercept the corresponding request , And support data modification

Modify the response content returned by the server , For example, will success It is amended as follows fail
If you want to do some more detailed breakpoint configuration settings Breakpoint Settings

07APP Grab the bag

and Fiddler equally ,Charles You can also catch APP End of the package , The following settings are required ,ProxySetting Setting in allows remote access HTTP agent

The computer is connected to the mobile phone WiFi, Set... On the mobile terminal WiFi agent , Point to Charles Where ip and 8888 port

Last ,Charles There are many advanced features , You can go to the official website to view the documents for learning .

The house needs to be built layer by layer , Knowledge needs to be learned at one point one . We should lay a good foundation in the process of learning , More hands-on practice , Don't talk much , The last dry goods here ！ I stayed up late to sort out the stages ( function 、 Interface 、 automation 、 performance 、 Test open ) Skills learning materials + Practical explanation , Very suitable for studying in private , It's much more efficient than self-study , Share with you .

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