In message , at 00:23:02 on
Thu, 29 May 2014, Jarle Hammen Knudsen remarked:
If you look at RFC 3986 Appendix A [1], you will see that "space" is
simply not mentioned anywhere in the grammar for defining a URL. Since
it's not mentioned anywhere in the grammar, the only way to encode a
space is with percent-encoding (%20).

[1] http://www.ietf.org/rfc/rfc3986.txt

See the comment I made to recliner. The confusion in your mind is
between the textual representation of a url in a medium like usenet, and
the format of the url after it's been extracted from the usenet posting.
--
Roland Perry