Improve an error message
diff --git a/transport/http_util.go b/transport/http_util.go
index f9d9fdf..f1233fa 100644
--- a/transport/http_util.go
+++ b/transport/http_util.go
@@ -143,7 +143,7 @@
switch f.Name {
case "content-type":
if !strings.Contains(f.Value, "application/grpc") {
- d.err = StreamErrorf(codes.FailedPrecondition, "transport: received the unexpected header")
+ d.err = StreamErrorf(codes.FailedPrecondition, "transport: received the unexpected content-type %q", f.Value)
return
}
case "grpc-encoding":
