.well Known Apple App Site Association

VoM News Desk | February 19, 2025 | 03:20 PM IST | Business | Follow on Google News

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.

Creating 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.

Testing & Validation
As your app evolves, you’ll need to revise the AASA file to incorporate universal links for new user flows.

Errors in the AASA files are common, so validation of both the behavior and syntax of this file become an essential part of the process. Any mistakes in this file, once acknowledged by Apple’s CDNs, can effect universal linking behavior for all users – new or old.

Fortunately, there are several ways of verifying the behavior of the AASA file before the changes make it to Apple.

Bypassing The CDN
Associated Domains support an alternate mode that allows developers to verify the behavior of the modified AASA file by bypassing the CDNs and retrieving the file from your server directly.

To activate this mode in your Xcode project:

Go to Signing & Capabilities -> Associated Domains
Add ?mode=developer to the end of the domain entry (e.g. applinks:yourdomain.com?mode=developer)
Now, when you build and run your app, it will retrieve the updated AASA file directly from your server.

You can only use alternate modes during development and you must remove the query string from the Associated Domains before you submit your app to the App Store.

VoM News Desk

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