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-type(req() :: {cowboy, any()}).
-type(user_session() :: nonempty_string()).
-type(emittable() :: init|closed|{recv, binary()}).
-type(callback() :: fun((user_session(), emittable(), any()) -> ok)).
-type(logger() :: fun((any(), req(), websocket|http) -> req())).
-record(service, {prefix :: nonempty_string(),
callback :: callback(),
state :: any(),
sockjs_url :: nonempty_string(),
cookie_needed :: boolean(),
websocket :: boolean(),
disconnect_delay :: non_neg_integer(),
heartbeat_delay :: non_neg_integer(),
response_limit :: non_neg_integer(),
logger :: logger()
}).
-type(service() :: #service{}).
-type(headers() :: list({nonempty_string(), nonempty_string()})).
-type(server() :: nonempty_string()).
-type(session() :: nonempty_string()).
-type(frame() :: {open, nil} |
{close, {non_neg_integer(), string()}} |
{data, list(iodata())} |
{heartbeat, nil} ).
-type(info() :: [{atom(), any()}]).