"%3f" shouldn't be unescaped in HTTP URLs

[Sebastien Delafond <sdelafond@gmx.net>]

Quoting from Debian bug #573186[0]:

  Some HTTP URLs have literal '?' in them.  Since '?' also separates the
  path from query arguments, it needs to be escaped in the first case.
  These are examples of the two cases:

  - http://en.wikipedia.org/wiki/Who%27s_Afraid_of_Virginia_Woolf%3F
    (literal '?')
  - http://www.google.com/search?q=org+mode (query separator)

  These are the URLs generated by Org mode when exporting them to HTML:

  - http://en.wikipedia.org/wiki/Who%27s_Afraid_of_Virginia_Woolf?
  - http://www.google.com/search?q=org+mode

  I.e. '?' is left as is, but '%3f' is unescaped, producing the wrong
  URL (don't be fooled by the fact that Wikipedia actually accepts it ;)
  ).  This makes impossible to correctly export an HTTP URL with a
  literal question mark in it.

  The solution would be to leave '%3f' as is, too, in the same way as
  '%27' has been left as is in the previous example.

What do you guys think ?

Cheers,

--Seb

[0] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=573186