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Re:Ask HN: How do you check a url is valid? by icebraining on Friday October 20, 2017 @01:29PM (#15517568)
Check Whois, DNS and make an HTTP request?

This feels like an XY Problem, though. What are you trying to achieve by checking if the URL is valid?

Re:Ask HN: How do you check a url is valid? by lookingfj on Saturday October 21, 2017 @12:04PM (#15522282)
That the url is valid