404
404 what should I do if I don't jump to 404?
you can modify the 404 page to indicate that the file no longer exists
or
if you want to pre-detect whether the file exists, you can send a head request by ajax to determine whether the path is correct. For the incorrect path, you can do extra processing
window.open to open a new page, so 404 is also on the new page
or download by creating iframe to process the error
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