Why does the percent sign in a URL cause an HTTP 400 Bad Request error?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Hypnotic Puzzle2

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Chapters
00:00 Question
00:55 Accepted answer (Score 35)
02:58 Answer 2 (Score 9)
03:16 Thank you

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Full question
https://superuser.com/questions/759959/w...

Question links:
https://superuser.com/%
http://mozilla.org/%

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Tags
#apachehttpserver #webserver #http #nginx

#avk47