Requests to /.well-known/apple-app-site-association

Question

I just checked my server logs and found the following weird requests coming in quite a lot. I have iOS 9 Universal Linking implemented, but those requests are running agains

Answer 1

Since iOS 9.3 Apple will first try to download /.well-known/apple-app-site-association and in case it fails it fallbacks to /apple-app-site-association.

See Apple's Technical Q&A QA1919:

Incoming requests for /.well-known/apple-app-site-association file

Q: Why is my web server receiving requests for https://example.com/.well-known/apple-app-site-association?

A: The recently released iOS 9.3 update implements RFC 5785. Because of this, devices running iOS 9.3 will first request /.well-known/apple-app-site-association for the apple-app-site-association file that is required to implement Universal Links and Shared Web Credentials. If the file is not found in this location, then the device will request the file in the root of the web server, as with prior releases of iOS 9.