Charles proxy is a tool we can use to monitor device outgoing traffic. One usage for this is to troubleshoot issues with app on a phone. Using this tool, we can see all outbound traffic including the request and response payloads.
Setting it up involves multiple steps :
- Download Charles Proxy on your local machine and launch.
- If necessary, send an IT Support ticket to obtain a license. Then in the Help tab, click on Register license and enter Certificate info.
- In the Proxy tab,
- For “SSL Proxying Settings…“, add the following:
- Host: *
- Port: 443
- For “Proxy Settings“, ensure the following:
- In the “Proxies” tab,
- Set Port: 8888
- Enable transparant HTTP proxying
- In the “Mac OS X” tab,
- Enable Mac OS X proxy
- Enable Use HTTP Proxy
- Enable Mac OS X proxy at startup
- In the “Proxies” tab,
- For “SSL Proxying Settings…“, add the following:
- In the Help tab,
- Click SSL Proxying > Install Charles Root Certificate > Trust it in your Keychain (for Mac)
- Check your iOS/Android device’s wireless settings and make sure it’s the same wireless network on your local machine ie: “phunware-an”
- On your device’s wireless network settings, set your device’s HTTP Proxy settings to “Manual”
- iOS
- Server : Your laptop/computer’s IP address
- Port : Specified in Step 2 (usually 8888)
- Android (Hold the wireless network name > Modify network > Show advanced options
- Proxy Hostname : Your laptop/computer’s IP address
- Proxy Port : Specified in Step 2 (usually 8888)
- iOS
- On Charles Proxy, accept a prompt that a connection is being made.
- On the device, open a browser and go to http://www.charlesproxy.com/getssl and install the certificate. If the page is unable to load or you don’t see the certificate prompt – turn off your wireless settings, reload that page, turn back on your wireless settings, and hit refresh.
- iOS – Install and trust it in Settings > General > Profiles & Device Management. Android – Give the certificate a name and save.
- For iOS 10 and above, you have to enable trust in Settings > General > About > Certificate Trust Settings > Enable Full Trust For Root Certificates
- You are now able to see device network traffic.
techyholmes 
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