Everything You Need To Know About The Apple App Site Association File
The Apple App Site Association (AASA) file enables iOS features like Universal Links, Shared Web Credentials, Handoff, and App Clips by establishing a secure and verified link between your iOS app(s) and a web domain.
If you've noticed that certain links on the mobile web versions of Instagram or YouTube keep you in the browser, while others redirect you into the app, this behavior is all being driven by the AASA file.
The Apple App Site Association file is a configuration file that defines how URLs are handled and specifies whether they open in a web browser or link directly to content within an app.
For the CDNs to successfully cache this file, it must be hosted on a domain that is available to all IP addresses and ranges, serves the file over HTTPS, does not redirect, and is not blocked by access policies.
You should also make sure your server serves the file with Content-Type: application/json and that the file doesn't exceed 128KB in size.
