in reply to Get valid url
Your definition of "invalid" is incomplete.
- "Formally valid" is easy.
- 404 is relatively easy.
- What about temporary failures? "Site maintenance, please check back in 5 minutes"?
- "Bandwidth exceeded" - invalid for the rest of the month, then valid again?
- What about corporate intranets - valid inside, invalid outside?
- "This content is not available in your country?"
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