Detect if unhandled rejection is due to adblock

Asked Dec 18 '19 at 16:35

Active Dec 18 '19 at 16:35

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I am writing an unhandled Promise rejection handler. Within the handler, I want to be able to tell if the rejection is caused by the client blocking a fetch request, via adblock or etc.

With adblock enabled, if you try to fetch "https://ad.doubleclick.net", it shows net::ERR_BLOCKED_BY_CLIENT in the console:

But when that bubbles out to window.onunhandledrejection, there's no way to tell that that's why the Promise was rejected; the error message says "TypeError: failed to fetch", but that's pretty vague.

Is there a way to detect that the error is due to adblock?

asked Dec 18 '19 at 16:35

Suchipi

you need to pass response message into callback rejection and then parse response status/code. – demkovych Dec 18 '19 at 16:37
there's no response, since the Promise is rejected. – Suchipi Dec 18 '19 at 16:51
could you share a code with request? – demkovych Dec 18 '19 at 16:53
This is a copy of question https://stackoverflow.com/questions/40527328/is-it-possible-to-catch-neterr-blocked-by-client – demkovych Dec 18 '19 at 16:55

Detect if unhandled rejection is due to adblock

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