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Is possible to intercept 404 error without using web server (browsing html file in the filesystem) ?
I tried with some javascript, using an hidden iframe that preload the destination page and check for the result and then trigger a custom error or redirect to the correct page.
This work fine but is not good on perfomance.
A 404 error is an HTTP status response. So unless you are trying to retrieve this file using an HTTP request/response, you can’t have a genuine 404 error. You can only mimic one in something like the way you suggest. Any “standard” way of handling a 404 error is dependent on your flavour of web server anyway…