RFC 1738: Uniform Resource Locators (URL) specification
The specification for URLs (,
Dec. '94) poses a problem, in that it limits the use of allowed characters
in URLs to only a limited subset of the US-ASCII character set:
"...Only alphanumerics [0-9a-zA-Z],
the special characters "$-_.+!*'()," [not including the quotes -
ed], and reserved characters used for their reserved purposes may
be used unencoded within a URL."
