How to check if an app is installed from a web-page on an iPhone?

I want to create a web-page, a page that will redirect an iPhone to the app-store if the iPhone does not have the application installed, but if the iPhone has the app installed I want it to open the application.

I have already implemented a custom url in the iPhone application so I have an url for the application that is something like:


And if this url is invalid, I want the page to redirect to the app store. Is this possible at all?

If I don't have the application installed on the phone and write the myapp:// url in safari, all I get is an error message.

Even if there exists an ugly hack with javascript I would really like to know?

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