So I have an iPhone with the IMDB app installed. When I search for a movie through the safari web browser and click a link for an IMDB page how does the phone know “hey I see IMDB is installed, instead of opening this page in the safari browser I’ll open it through the installed app”.
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Your phone contains a sign-up sheet where apps can write down the names of specific websites with an attached note saying, “If you see this website, send it to me!” Apps sign up on this sheet at the time you install them.
Every time your phone opens a link, it checks the sign-up sheet to see if the website matches any of the names on the list. If a match is found, the link is opened to whatever app asked for it. If no match is found, it defaults to your web browser.
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