[master] dee47cc47 VSL a SLT_RespProtocol HTTP/2.0 when we deliver by H2

[Poul-Henning Kamp]

commit dee47cc47b52dd8af11cb073661e9a757944aa7c
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Wed Feb 27 09:05:08 2019 +0000

    VSL a SLT_RespProtocol HTTP/2.0 when we deliver by H2
    
    Closes #2905

diff --git a/bin/varnishd/http2/cache_http2_deliver.c b/bin/varnishd/http2/cache_http2_deliver.c
index f19565011..20609e8e7 100644
--- a/bin/varnishd/http2/cache_http2_deliver.c
+++ b/bin/varnishd/http2/cache_http2_deliver.c
@@ -235,6 +235,7 @@ h2_deliver(struct req *req, struct boc *boc, int sendbody)
 	sp = req->sp;
 	CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
 
+	VSLb(req->vsl, SLT_RespProtocol, "HTTP/2.0");
 	l = WS_Reserve(req->ws, 0);
 	AN(VSB_new(&resp, req->ws->f, l, VSB_FIXEDLEN));