talking proxy to backends

[Poul-Henning Kamp]

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In message <CAKBjT_5cY3HaMTjdGfaE7vFjZpw4+Fk+BBss7f4My+hXBs6Q6Q at mail.gmail.com>
, Audun Ytterdal writes:

The reason PROXY makes sense for HAproxy and similar "plumbing"
proxies, is that they do no session-multiplexing to begin with, so
PROXY only has upsides for them:  Send a prefix, then just move
bytes.

For Varnish much richer feature set, PROXY between Varnish and the
backend has significant downsides.

The biggest downside is that that any V->BE connection can only
ever be used for requests coming from one single C->V connection.

(X-)Forwarded-For doesn't have that problem.

That said, it wouldn't be too hard to make it possible to send
PROXY to the backend.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.