wrt HTTP Origin header serialization (was Re: The HTTP Sec-From Header (draft-abarth-origin))

serialization rules in draft-abarth-origin wrt a "scheme/host/port tuple" yield 
a tuple looking like..

   scheme://host:port

Earlier in this thread someone asked about what would happen if one 
dereferenced such a string, and the answer was (I am paraphrasing here) "don't 
do that, it isn't a URI".

However, syntactically, it *is* a URI.

I suggest that a serialized origin ought to have a syntax that is not 
syntactically a URI, e.g. pick some separator char that allows for reasonable 
parsing (i.e. won't be confused with whatever might appear in a <host> 
production (which can contain IPv4 and IPv6 address serializations)), such as 
perhaps...

   scheme/host/port, or
   scheme#host#port, or
   scheme?host?port, or
   scheme@host@port

..i.e. the <gen-delim> values from RFC3986 that aren't included in the 
IP-literal, IPvFuture, IPv6address, reg-name, etc productions (that <host> 
depends upon).

=JeffH