How to install Certificate and debug HTTPS contents in macOS device.
Install Certificates on macOS
In order to intercept encrypted HTTPS messages (Request or Response), you have to install Proxyman CA Certificate on your current machine. This step is mandatory for iOS, Android devices, iOS simulators, Java VMs, and Firefox too.
You can install the Proxyman CA Certificate by navigating to
Certificate menu -> Install Certificate on this Mac...
The Proxyman Certificate is a self-signed certificate, which is generated in your machine. Proxyman never stores or transmits any personal data to Proxyman's server or 3rd-party.
Make sure that you Delete the Proxyman Certificate in Keychain app if you're not using Proxyman anymore. If not, anyone who has the Proxyman Certificate can intercept your HTTP/HTTPS requests from your macOS machine.