Hot on the whole network, Charles packet capture tutorial - auxiliary interface test (1)

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foreword

charles is a very good packet capture tool, supported by all platforms, it can be used on mac, windows, linux, it can capture both web-side packets and app-side packets.

The main functions of charles include the following points:
Intercept Http and Https network packets.
Supports resending network requests to facilitate back-end debugging.
Support modifying network request parameters.
Supports the interception and dynamic modification of network requests.
Support for simulating slow networks

The working principle of the proxy server:
the client initiates a request, the request is forwarded to the server through Charles, the server returns a response, and the response is forwarded to the client through Charles.

The role played by charles is equivalent to a messenger, passing information from A to B, and passing the reply from B to A. Because of his work as a messenger, he knows the content of the information (whether it is the original letter or the reply), Because of this, Charles can also tamper with the content of the information, that is, tamper with the request and response.

I won’t say anything about installation , there are a lot of online tutorials

Basic settings
Turn on the proxy (it is turned on by default)

https settings and certificate installation,
first set the proxy

install certificate

Set ssl proxy
Click the menu item "Proxy" -> "SSL Proxy Settings"

Click [Add], and in the pop-up "Edit Location" window, enter an asterisk in the host and port text boxes, as shown in the screenshot below, and click [OK] in the "Edit Location" window

Then in the "SSL Proxy Settings" window, click [OK]

Separate settings for the chrome browser
For https capture on the chrome browser, the following operations need to be performed

Save the charles certificate first, and select binary when saving

Open the settings interface of the chrome browser, search for certificates, and enter the certificate management interface

Mobile terminal packet capture configuration

Mobile phone connection proxy settings
First, make sure that the mobile phone and the computer where Charles is located are in the same local area network, then set the code connection of the mobile phone, long press the wifi of the mobile phone, open and modify the network

The ip is the ip of the computer where Charles is located, and the port is the port number 8888 seen in the Charles proxy settings.

When connecting to the proxy for the first time, charles will pop up a confirmation box, remember to click allow

Enter chls.pro/ssl in the mobile browser and it will prompt you to download the certificate, just download and install it

The ios mobile phone also needs to trust the certificate in Settings-General-About This Machine-Certificate Trust Settings

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