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director batman round-robin {
	{ .backend = b1; }
	{ .backend = b2; }
	{ .backend = b3; }
}

sub vcl_recv {
	set req.backend = batman;
}

The backend will then be chosen in a round robin fashion.



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prefix "VEV".

This is a general purpose eventmanager and as such should live in
the library where other programs can get at it.



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Add a backend property ".host_header" to set default content of Host:
header if client didn't provide one.

If .host_header is not specified, it defaults to .host.

Add testcase for this logic.

(Incidental change: Use "interval" instead of "rate" for backend pollers.)





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It doesn't actually do anything yet.



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clear expression of intent in VCL.

We now fail backend hostnames that resolve to multiple IPv4 or multiple
IPv6 addresses, in other words, you cannot use "cnn.com" as a backend
hostname specification without the compiler yelling at you:

    % ./varnishd -d -d -b cnn.com -a :8080
    Backend host "cnn.com": resolves to multiple IPv4 addresses.
    Only one address is allowed.
    Please specify which exact address you want to use, we found these:
	    64.236.16.20
	    64.236.16.52
	    64.236.24.12
	    64.236.29.120
    [...]
    VCL compilation failed

However, you _can_ use a hostname that resolves to both an IPv4 and
an IPv6 address, and the new paramter "prefer_ipv6" will determine
which one we try first in such cases.

The other part of this change is that we now do the DNS lookup at
VCL compiletime, and only then.

If your backend's DNS record (or /etc/hosts entry) changes IP#, you
must reload your VCL code to notify varnish.

Finer technical points:

We build a bytestring representation of the sockaddr's in VCC and
include them in the concept of backend identity, for an existing
backend (+ connections) to be reused for a new VCL the backend must
now be defined exactly the same way AND have the same resolved
IPv4/IPv6 addresses.

Since we never muck about with the address in the backend struct
anymore, it's static for the life of the struct backend instance,
we can simplify and eliminate the locking dance around our connection
attempts.

Also eliminate the struct vrt_backend inclusion in struct backend,
and instead make the relevat fields full-blown members of struct
backend.  This eliminates a number of TRUST_ME() calls.

This is the companion commit to #2934 which prepared the VCL compiler.


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IPv6 addresses, but accept one of each.

Emit a bytestring representation of the sockaddr we found for each
of these, into the shared object, so we avoid doing a DNS lookup
again in the cacher.



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	<esi:include  foo=bar src=/body2 />



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	<esi:include  src= />
would result in a NUL byte when looking for the next attribute.



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Ignore unknown include attributes and
Warn about src attributes without value



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backend hosts.



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with each other.



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"available" or "discarded".



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VCL programs, but in practice it didn't happen because we fired the
GC function VCL_Idle() after 5 seconds of silence on the CLI port and
the manager pings every three (by default).

Instead change the name of VCL_Idle() to VCL_Poll() and call it
before every CLI command, so that any query command will get an
up to date status.



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