How to register a python script with mac OSX as a web browser

Question

I have a python script that accepts URLs and displays them and I want to register it with the operation system (mac OS El Captain/Sierra), so that the script shows up in the list of possible Default web browser (in the General pane of the System Preferences).

I assume I have to turn the script into an app (e.g. via Platypus) and then modify the application bundle's Info.plist file or another config file. But what key do I have to set? And how does this the registern with the system?

Note: I do not want to register the script for a new URI protocol, just add the script to the possible Default browsers which handle HTTP, etc...

Answer 1

Platypus itself can do this! In the main Settings window

select Accepts Dropped Items. Then press the newly appearing Settings Button and in the Drop Settings dialog

check Register as URI scheme handler and add the desired URI scheme(s). Run the generated app at least once and then it should appear in the list of possible Default web browsers.