1 files changed, 7 insertions, 0 deletions
diff --git a/cast/sender/channel/message_util.h b/cast/sender/channel/message_util.h
index 944165bc..1a8c7717 100644
--- a/cast/sender/channel/message_util.h
+++ b/cast/sender/channel/message_util.h
@@ -7,6 +7,7 @@
 
 #include "cast/common/channel/message_util.h"
 #include "cast/common/channel/proto/cast_channel.pb.h"
+#include "platform/base/error.h"
 
 namespace openscreen {
 namespace cast {
@@ -16,6 +17,12 @@ class AuthContext;
 ::cast::channel::CastMessage CreateAuthChallengeMessage(
     const AuthContext& auth_context);
 
+// |request_id| must be unique for |sender_id|.
+ErrorOr<::cast::channel::CastMessage> CreateAppAvailabilityRequest(
+    const std::string& sender_id,
+    int request_id,
+    const std::string& app_id);
+
 }  // namespace cast
 }  // namespace openscreen