What's the simplest way to test if a link is valid?

I've got a script that throughly checks the dns, etc. But, I'd also like to check to see if the user has inputted a valid link to a webpage.

File_exists() and etc. seem to have a lot of caveats.

E.g., foo.com/bar/file.txt

Most things I've looked at are gross overkill.


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