How to get Google Chrome to open a custom URL scheme handler?

Question

I have a html test page with the link:

<a href="customprotocol:information-from-browser">Link.</a>

If I open this in Safari and click on the link, the handling app (a custom app) opens correctly.

But when I open this page in Google Chrome and click on the link, the app does not open.

The clicked link fires a GET request, but it's status is cancelled. And the whole request is shown in red in the Network Inspector.

I thought maybe Chrome does this for security reasons, and blocks unregistered custom URL schemes by default. To get around this, I added a bit of javascript to the html page (from this question):

window.location.assign("customprotocol:");

which pops up a dialog asking if the user wants to associate customprotocol: with the app.

Even after pressing OK and thus setting the customprotocol: handler recognized by chrome, the link still does not launch the app. It remains a cancelled request.

Why is this? How do I get this to work in Google Chrome?

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Note 1: AFAIK, all my software are updated to the latest versions.

Note 2: The cancelled request has no response and preview information. Under timing, the request shows as stalled.

Answer 1

In general, it seems that protocols are actually passed onto the OS if chrome doesn't recognize them. So you may have just confused your chrome.

Look how steam://browsemedia works for Valve's game manager Steam. Debug that link and I bet it actually gets the same results that you got. Try, mailto:me it successfully opens my email client. Obviously the browser doesn't need to send and actual request, So I would ignore all your request analyzing. I tested this, the "Stalled" status is CORRECT.

I think you need to reset whatever customhandler settings you have got in chrome. I think it may be interfering with letting the OS deal with it.