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Comment by dang | Hacker News Reader

No, you entered it fine, but our software has recently begun rewriting URLs to the canonical URL if the page has one, and this page has

  //actu.epfl.ch/news/scientists-discover-a-highly-potent-antibody-again/

...which isn't valid, but we might as well tweak the code to handle such cases. In the meantime I've restored the URL. Sorry for the error!

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That's a valid URL, AFAICT.

https://www.paulirish.com/2010/the-protocol-relative-url/

Whoa! TIL

Edit: fixed now. Thanks you guys.

Glad I could contribute something :)

As the other comment says, it's a valid URL but to really rub it in, the canonical link RFC (6596) says it's valid and then also uses a relative URL in an example like they were just waiting for someone to be wrong about this on the internet.

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