http: eliminate "# service" line when using protocol v2

When an http info/refs request is made, requesting that protocol v2 be
used, don't send a "# service" line since this line is not part of the
v2 spec.
Signed-off-by: NBrandon Williams <bmwill@google.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

http-backend.c

@@ -10,6 +10,7 @@
 #include "url.h"
 #include "argv-array.h"
 #include "packfile.h"
+#include "protocol.h"
 
 static const char content_type[] = "Content-Type";
 static const char content_length[] = "Content-Length";
@@ -466,8 +467,11 @@ static void get_info_refs(struct strbuf *hdr, char *arg)
 		hdr_str(hdr, content_type, buf.buf);
 		end_headers(hdr);
 
-		packet_write_fmt(1, "# service=git-%s\n", svc->name);
-		packet_flush(1);
+
+		if (determine_protocol_version_server() != protocol_v2) {
+			packet_write_fmt(1, "# service=git-%s\n", svc->name);
+			packet_flush(1);
+		}
 
 		argv[0] = svc->name;
 		run_service(argv, 0);

remote-curl.c

@@ -396,6 +396,9 @@ static struct discovery *discover_refs(const char *service, int for_push)
 			;
 
 		last->proto_git = 1;
+	} else if (maybe_smart &&
+		   last->len > 5 && starts_with(last->buf + 4, "version 2")) {
+		last->proto_git = 1;
 	}
 
 	if (last->proto_git)