RFC 3986 recommends in section 2.3 that for "unreserved characters",
defined as
unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
no percent-encoded octets should be created. URIs that differ in the replacement
of an unreserved character with its corresponding percent-encoded US-ASCII octet
are equivalent: they identify the same resource.
It there a chance to alter this in ns_urlencode. i can certainly do this
in tcl, but this is not the point.
best regards
-gustaf neumann
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