Add host property to Request

[lkraider]

An extra property to get only the url scheme e netloc parts from the request
url, useful when mapping to other urls within the same domain in the handlers.

[lkraider]

I don't think all handlers will use this property, so you'll be trading access cost for some handlers vs initialization cost for all handlers. It could be memoized, but I don't see much need to do so.

[sethmurphy]

I agree with Paul, we should be very careful adding anything that touches
every request. Ben's suggestion seems like the perfect compromise, adding a
function in the request module to parse the header as needed and leaving
the request class alone. There was a thread on this in the group a while
back:
https://groups.google.com/forum/?fromgroups=#!topic/brubeck-dev/QZNIBzFgKcs

On Mon, Apr 22, 2013 at 3:13 PM, Paul Eipper [email protected]:

I don't think all handlers will use this property, so you'll be trading
access cost for some handlers vs initialization cost for all handlers. It
could be memoized, but I don't see much need to do so.

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