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-rw-r--r--src/cowboy_websocket.erl2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cowboy_websocket.erl b/src/cowboy_websocket.erl
index c0f94c4..9577086 100644
--- a/src/cowboy_websocket.erl
+++ b/src/cowboy_websocket.erl
@@ -570,7 +570,7 @@ websocket_dispatch(State, Req, HandlerState, _RemainingData, 8,
%% Ping control frame. Send a pong back and forward the ping to the handler.
websocket_dispatch(State=#state{socket=Socket, transport=Transport},
Req, HandlerState, RemainingData, 9, Payload) ->
- Len = payload_length_to_binary(byte_size(Payload)),
+ Len = payload_length_to_binary(iolist_size(Payload)),
Transport:send(Socket, << 1:1, 0:3, 10:4, 0:1, Len/bits, Payload/binary >>),
handler_call(State, Req, HandlerState, RemainingData,
websocket_handle, {ping, Payload}, fun websocket_data/4);