I'll update that link. Checking for size changes would be a useful heuristic, but you'd need to load the equivalent URL off the disk or something like that, and my experience has been that links tend to go completely dead rather than half-dead, so I don't sweat it much.
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Whilst the link to linkchecker @ sourceforge still works, they have moved the project to GitHub.
Perhaps checking for a recent last-modified date together with a large relative change in size would suffice for this situation.
I'll update that link. Checking for size changes would be a useful heuristic, but you'd need to load the equivalent URL off the disk or something like that, and my experience has been that links tend to go completely dead rather than half-dead, so I don't sweat it much.