All 7 Deep Linking in Flutter questions
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What is deep linking in a Flutter app, and how does it let a specific URL or link open directly to a particular screen within the app rather than always just opening the app's default home screen? How does the go_router package simplify handling deep links in a Flutter app compared to manually parsing incoming URLs yourself using Navigator 2.0's lower level APIs directly? How should a Flutter app properly handle a deep link that points to a specific screen requiring the user to first be authenticated, if that user is not actually currently logged in yet? How does Firebase Dynamic Links, or a similar deferred deep linking service, let a deep link correctly work even when the target app is not yet actually installed, directing the user to install it first before then opening the intended content? What testing strategies help ensure deep links continue working correctly across app updates, especially as new screens and routes are added or existing route patterns change over time? How can deep linking be combined with push notifications to let tapping a notification navigate a user directly to the specific relevant screen related to that particular notification's content?
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Flutter › Deep Linking in Flutter

What is the difference between a custom URL scheme deep link, such as myapp://, and a universal link or Android app link that uses a standard https:// web address?

Beginner

Answer

A custom URL scheme deep link uses your own unique made up scheme, such as myapp://, which only actually works correctly if the target app is already installed on the device, and otherwise typically just fails silently with no fallback, whereas a universal link on iOS or an app link on Android uses a completely standard https address that already properly resolves to your actual website in a normal browser, but is additionally specially configured to instead open directly within your native app when it is installed, providing a much better and more graceful fallback experience for users who do not yet actually have the app installed.
// Universal link configuration requires hosting a special file
https://myapp.com/.well-known/apple-app-site-association
Real-world example A company chooses universal links over a simple custom URL scheme specifically so that a shared product link still gracefully opens their actual mobile website in a browser for users who have not yet installed their native app, rather than the link simply failing to do anything at all.

Common follow-ups: What specific server side configuration files are required to properly support universal links and app links?;Can an app support both a custom URL scheme and universal links at the same time?

Navigation & Routing in Flutter;Flutter Web Performance & SEO
All 7 Deep Linking in Flutter questions