Determine if a URI is registered on the client machine?

Is it possible for the web application to detect if a protocol (URI scheme) is registered on the client machine? For example, "spotify:" or "skype:".

Tried to open url in hidden iframe - didn't work ...

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I would think that this is not so.

This will require the browser to indirectly find out what applications the user has installed on his software, which is unnecessary transparency and therefore: a security risk.

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Source: https://habr.com/ru/post/1382456/


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