Charles Proxy is one of the most used tool in mobile developers kit.
Here is a brief on the the steps required to make it work in an enterprise VPN setup.
I am using Charles proxy version 4.1.2 on mac.
- Download it from here and install it. Grant necessary permission.
- Make sure in your network settings, auto proxy is not turned on.
- One point to keep in mind is that, any network settings related changes should be done before running Charles. Also make sure to run the iOS simulator only after running the Charles.
- Run Charles and install the root certs for iOS simulators.
- Upon success, you should be seeing this:
- Now, you can see all the traffic originating from your mac machine. There are two ways to segregate the data in the UI. They are Structure and Sequence. In the sequence mode, you can apply filter and see only traffic data you are interested in.
- Structure View
- Sequence View with filter applied
- On a side note, it is a good idea to keep the request and response separate in UI.
- Run your Xcode project and identify the traffic to the domain you are interested in. At first, you would see the encrypted content like below. I just opened apple.com in iOS simulator’s Safari app.
- In the above example, we are interested in http://www.apple.com. In order to see the content in plain text we need to enable ‘SSL Proxying’ for this domain. There are multiple ways to do this. The easiest is to right click the domain in the Structure View and select the option ‘SSL Proxying’ from menu
- You should see a blue globe like icon next to all domains, whose content is decrypted or readable by Charles.
13. Once, done you can see all the traffic in plain text
You can also set breakpoints against a specific domain and edit the requests/responses based on your needs.There is no extra steps to be done if you are developing behind a VPN, based on my experience.