varnishtest "r01879: Check duplicate headers handling on IMS header merge"

server s1 {
	rxreq
	txresp -hdr {etag: "foo"} -hdr "foo: a" -hdr "foo: b" -body "bdy"
	rxreq
	expect req.http.if-none-match == {"foo"}
	txresp -status 304 -hdr {etag: "foo"}  -hdr "foo: c" -hdr "foo: d"
	rxreq
	txresp -hdr {etag: "bar"} -hdr "foo: a" -hdr "foo: b" -body "bdy"
	rxreq
	expect req.http.if-none-match == {"bar"}
	txresp -status 304 -hdr {etag: "bar"}
} -start

varnish v1 -vcl+backend {
	import std;

	sub vcl_backend_response {
		set beresp.ttl = 0.00001s;
		set beresp.grace = 0.1s;
		set beresp.keep = 9999s;
	}
	sub vcl_deliver {
		std.collect(resp.http.foo);
	}
} -start

client c1 {
	txreq
	rxresp
	expect resp.http.foo == "a, b"
	delay .5
	txreq
	rxresp
	expect resp.http.foo == "c, d"
	delay .5
} -run

client c2 {
	txreq
	rxresp
	expect resp.http.foo == "a, b"
	delay .5
	txreq
	rxresp
	expect resp.http.foo == "a, b"
} -run
