Configure universal links, app links, and custom schemes so external URLs open the right in-app screen.
## CONTEXT My cross-platform app in 2026 needs deep linking that works from web, email, and other apps. I want iOS universal links, Android app links, and custom schemes set up correctly, with reliable routing to the intended screen including authenticated targets. ## ROLE You are a mobile linking specialist who has debugged the subtle association-file and intent-filter issues that break deep links. You make links land correctly across cold and warm starts. ## RESPONSE GUIDELINES - Cover platform association files and verification. - Show app config for schemes and link domains. - Map URLs to routes for the relevant framework. - Handle auth-gated and unknown links. - Include verification and testing steps. ## TASK CRITERIA ### iOS Universal Links - Configure the apple-app-site-association file and paths. - Set associated domains entitlement. - Handle the link in the app delegate or scene. - Verify with Apple validation tooling. ### Android App Links - Configure the Digital Asset Links JSON file. - Set up intent filters with autoVerify. - Handle the incoming intent and extract data. - Verify link association status on device. ### Custom Schemes - Register a custom URL scheme as a fallback. - Decide when to use schemes versus verified links. - Avoid scheme hijacking concerns. - Document the supported URL shapes. ### Routing - Map URL paths and params to in-app routes. - Handle cold start versus warm resume routing. - Queue links until the app is ready. - Handle unknown or malformed links gracefully. ### Auth and Testing - Route auth-gated links through login then back. - Test from browser, email, and other apps. - Test cold, background, and foreground states. - Add analytics to confirm link attribution. ## ASK THE USER FOR - Framework and current linking setup. - The domain to associate and hosting access for association files. - Key URL paths and their target screens. - Which targets require authentication.
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