https://en.wikipedia.org/wiki/%00
But what the hell does it do??? In Safari and Firefox, I get an nginx 400 Bad Request page from en.wikipedia.org. But in Chrome, it seems to be redirecting to a google search for the same url, when I type it into the address bar. Well, that's meta. Chrome won't even let me drag-and-drop that icky %00 terminated url from one page into another page to navigate there -- it angrily rejects it and sadly animates the evil url back to where it came from (though dragging it into an existing or new tab mysteriously works). But actually clicking on that link immediately goes to a blank purgatory page with the url "about:blank#blocked". Those are Chrome's stories, and it's sticking with them.
At least this works:
https://en.wikipedia.org/wiki/%01
>Special Page
>Bad title
>The requested page title contains an invalid UTF-8 sequence.
>Return to Main Page.
Oh, yeah -- PHP:
https://webmasters.stackexchange.com/questions/84008/url-enc...
If not the actual NUL character, then at least the Unicode Symbol for NUL redirects to the page on the Null character.
https://en.wikipedia.org/wiki/␀
>Null character
>From Wikipedia, the free encyclopedia
>(Redirected from ␀)
>For other uses, see Null symbol.
...But then again, shouldn't the Null symbol ␀ redirect to the page on the Null symbol, which it actually is, not the page on the Null character, which it only symbolizes?