[master] abefe72 Add a debug facility to force a V1L_Flush after the headers.

[Poul-Henning Kamp]

commit abefe72ece143e7bb5a6575e135c1de1d363c727
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Thu Oct 30 15:30:12 2014 +0000

    Add a debug facility to force a V1L_Flush after the headers.

diff --git a/bin/varnishd/http1/cache_http1_deliver.c b/bin/varnishd/http1/cache_http1_deliver.c
index 84cd582..bc24ff3 100644
--- a/bin/varnishd/http1/cache_http1_deliver.c
+++ b/bin/varnishd/http1/cache_http1_deliver.c
@@ -150,6 +150,8 @@ V1D_Deliver(struct req *req, struct busyobj *bo)
 	V1L_Reserve(req->wrk, req->ws, &req->sp->fd, req->vsl, req->t_prev);
 
 	req->acct.resp_hdrbytes += HTTP1_Write(req->wrk, req->resp, HTTP1_Resp);
+	if (DO_DEBUG(DBG_FLUSH_HEAD))
+		(void)V1L_Flush(req->wrk);
 
 	ois = OIS_DONE;
 	if (req->wantbody) {
diff --git a/include/tbl/debug_bits.h b/include/tbl/debug_bits.h
index 59bc64e..81d5e38 100644
--- a/include/tbl/debug_bits.h
+++ b/include/tbl/debug_bits.h
@@ -38,3 +38,4 @@ DEBUG_BIT(HASHEDGE,		hashedge,	"Edge cases in Hash")
 DEBUG_BIT(VCLREL,		vclrel,		"Rapid VCL release")
 DEBUG_BIT(LURKER,		lurker,		"VSL Ban lurker")
 DEBUG_BIT(ESI_CHOP,		esi_chop,	"Chop ESI fetch to bits")
+DEBUG_BIT(FLUSH_HEAD,		flush_head,	"Flush after http1 head")