Strip flags & final_flags when we switch to CONTINUATION headers.

Fixes #2934

bin/varnishd/http2/cache_http2_send.c

@@ -337,6 +337,8 @@ H2_Send(struct worker *wrk, struct h2_req *r2,
 			p += tf;
 			len -= tf;
 			ftyp = ftyp->continuation;
+			flags &= ftyp->flags;
+			final_flags &= ftyp->flags;
 		} while (!h2->error && len > 0);
 	}
 }

bin/varnishtest/tests/r02934.vtc

+varnishtest "Bug in CONTINUATION flags when no sendbody"
+
+server s1 {
+	rxreq
+	expect req.proto == HTTP/1.1
+	txresp -hdr "Content-Type: text/plain" -hdrlen Foo 100 
+
+} -start
+
+varnish v1 -cliok "param.set feature +http2"
+varnish v1 -cliok "param.set debug +syncvsl"
+varnish v1 -cliok "param.set debug +h2_nocheck"
+
+varnish v1 -vcl+backend { } -start
+
+client c1 {
+	stream 0 {
+		txsettings -framesize 64
+		rxsettings
+	} -run
+	stream 1 {
+		txreq -req HEAD 
+		rxresp
+		expect resp.status == 200
+		expect resp.http.content-Type == "text/plain"
+	} -run
+} -run