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Bad Request - Invalid URL

HTTP Error 400. The request URL is invalid.

  • 1
    This question opens in the mobile android app, but not on the mobile theme in a browser
    – Andy
    Aug 22, 2015 at 18:02
  • 7
    Yep, it sure does. Please don't put that back into the title while I fix it! I've edited at the database level to make this question available. Aug 24, 2015 at 14:17
  • A way to test if this is fixed is following this link
    – Braiam
    Aug 24, 2015 at 15:05
  • 5
    @Braiam no, it isn't; the fundamental problem is outside of our part of the stack: we can't make IIS happier. What we can do, however, is to not generate links that won't work. Which is what is now the case. And in particular: to not force a redirect to a broken url. Hence why you can now view this question. Aug 24, 2015 at 15:07
  • @Andy: I wondered how the question had five votes when my best URL hacking couldn't get it to display.... Aug 24, 2015 at 19:05
  • @MarcGravell then, why other web servers allow such combination? AFAIK, RFC 3986 allows any unreserved character using the percent-encoding method.
    – Braiam
    Aug 24, 2015 at 22:15
  • @Braiam because software often has glitches in a few edge cases Aug 24, 2015 at 22:44

1 Answer 1


There are some Unicode combinations that IIS just hates and refuses to play with no matter how much you %-encode them. You seem to have found another one! Congrats.

This will be fixed in the next build.


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