How to Mitigate Safari Warning "Do you want to allow this page to open XYZ"

Question

I am developing an application in Objective-C and Go. So far, everything is working out quite well - except for a few hiccups.

What I want to know is: Is it possible to mitigate the warning Safari gives me when clicking on a link, which opens an installed application with a custom URL scheme?

My application has a custom scheme. Let's say it is XYZ. When I click on a link, such as

xyz://dosomething?cool=yes+please

I get the warning

Do you want to allow this page to open XYZ?

Any way to not have this prompt come up every time?

Answer 1

That's a new security policy of Safari (in 10.12.2+), at the moment there is no way to go around it. Maybe in a future Safari update they'll add an option to "Always allow" or a preference setting to disable it.

If you google it you'll find tons of people with this problem since using URL schemes to launch external apps is a quite common approach... Very popular applications like Transmission use it.