Return true if an authority is present
This function returns true if the url contains an authority. The presence of an authority is denoted by a double slash ("//") at the beginning or after the scheme.
assert( url_view( "http://www.example.com/index.htm" ).has_authority() );
Constant.
Throws nothing.
authority       = [ userinfo "@" ] host [ ":" port ]
URI             = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
absolute-URI    = scheme ":" hier-part [ "?" query ]
URI-reference   = URI / relative-ref
relative-ref    = relative-part [ "?" query ] [ "#" fragment ]
hier-part       = "//" authority path-abempty
                ; (more...)
relative-part   = "//" authority path-abempty
                ; (more...)
true if the url contains an authority.