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-rw-r--r--src/cowboy_websocket.erl1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/cowboy_websocket.erl b/src/cowboy_websocket.erl
index fa74223..7bb5e74 100644
--- a/src/cowboy_websocket.erl
+++ b/src/cowboy_websocket.erl
@@ -17,6 +17,7 @@
%% Cowboy supports versions 7 through 17 of the Websocket drafts.
%% It also supports RFC6455, the proposed standard for Websocket.
-module(cowboy_websocket).
+-behaviour(cowboy_sub_protocol).
%% API.
-export([upgrade/4]).