I try to implement the iOS9
Universal Links
.
I m using this tutorial: http://blog.hokolinks.com/how-to-implement-apple-universal-links-on-ios-9
As of iOS 9 developer seed 2, you no longer need to sign the apple-app-site-association file for Universal links. Most places on the web still reference the need to sign the file as do the official Apple Docs. Here's the WWDC session where it was announced that you no longer need to sign the file. https://developer.apple.com/videos/play/wwdc2015-509/ goto ~14 mins in to the video where they announce this and the limitations (not backwards compatible with iOS 8).
I have verified that Universal Links work with unsigned files on the official iOS 9 release.