Use fiddler to achieve mobile phone packet capture
The network request data cannot be directly viewed on the mobile phone, and a packet capture tool is required. Fiddler is a free web debugging agent that can be used to record, view and debug http / https communication between the mobile terminal and the remote server.
Fiddler does not have a mobile client, and it is installed on the PC. To capture the program on the mobile phone, you need to configure some of the fiddler on the PC and the mobile terminal. Proceed as follows:
1. PC side fiddler configuration
1. Install the HTTPS certificate
Many applications on mobile phones involve personal information, which is encrypted with relatively secure HTTPS. By default, fiddler only captures http sessions without grabbing HTTPS messages. As a result, https pages (such as Baidu) cannot be opened after fiddler is opened. : Open the Fiddler-> Tool-> Fiddler Options-> HTTPS tab, check and capture Capture HTTPS CONNECTs and Decrypt HTTPS traffic (HTTPS request decryption), and install the certificate (for the first time without certificate, it will pop up whether to trust Fiddler certificate and security prompt, click yes directly), restart Fiddler to take effect.
2. Allow the phone to connect remotely
If you want to capture the communication data on the mobile phone, you need to connect the mobile phone to the Fiddler proxy, and Fiddler does not allow other devices to connect by default. Solution: Click Fiddler-> Tools-> Options, select Allow remote computers to in the Connections panel connect allows other devices to connect (this operation needs to restart Fiddler to take effect).
3. View the IP address
- 电脑ip地址可通过cmd命令行输入ipconfig查询，或网络连接信息中找到，最直观的方法是将鼠标置于fiddler右上角的online中即可显示电脑的ip地址。如下图我的IP是192.168.1.106。
电脑IP
二、手机端配置
需要在移动终端（手机或pad）上指定代理服务器为Fiddler所在主机IP（需要处于同一网络），端口默认8888。
1. 接入网络
要保证手机和安装有fiddler的电脑处在同一局域网内，手机能ping通电脑。方法：家用或办公环境把PC和手机WLAN连接上同一个路由器的无线SSID获取到同一网段内的IP地址即可。台式机要插入无线网卡才能连WiFi，最好用笔记本电脑和手机连同一WiFi很方便。如下图，我的手机IP是192.168.1.104，与电脑192.168.1.106可互通，就能访问192.168.1.106:8888。
2. 手机安装根证书
在手机上需要安装Fiddler根证书，因为Fiddler是通过自己生成的证书对网络请求重新签名进行https会话解密的，如果不安装证书的话只能抓取HTTP请求。
（1）手机和电脑连接同一个网络，打开手机浏览器，输入Fiddler Server地址http://ipv4.fiddler:8888/（因为fiddler装在PC上，所以Fiddler Server地址就是PC的IP地址，带上端口号8888，我的是http://192.168.1.106:8888/）， 跳转到 Fiddler Echo Service 证书下载页，点击FiddlerRoot certificate下载并安装；
（2） 为证书命名后点击确定；
（3）要求设置一个手机密码，自己设置一个，记住密码就行，最后不用了去系统-安全-密码中去掉即可；
3. 手机代理设置
更改手机无线网的代理方法：打开系统设置-WLAN，长按WiFi接入的SSID修改网络，点击高级选项，代理选择手动，主机名输入fiddler的电脑ip地址192.168.1.106，端口号输入8888，保存即可。
三、抓包
PC上和手机上的配置完成后就可以操作手机，在电脑上用fiddler抓包了，比如访问一些网站和APP，fiddler中就会显示捕获到的手机上HTTP/HTTPS通讯记录，抓包成功。
四、还原手机状态
抓包结束后，需要手动还原手机状态，方法如下（不同机型可能有些微差别）：
（1） 停止电脑对手机的网络监控：系统设置-WLAN，长按wifi修改网络，高级选项找到代理，去掉手动代理即可；
（2）删除手机中证书：安卓系统设置 系统 设备安全 受信任的凭据 用户 ，点击证书删除即可；
（3） 删除手机上密码：手机系统—安全—密码，删除系统密码即可。