protocol: use return shortcut instead of respond function
adding ab renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3a renamed from b:37d9b5d994eab34eda9c16b195ace52c7b129980% test with --revb renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3