interface incoming-handler {
    use types.{request, response, error-code};

    handle: func(request: request) -> result<response, error-code>;
}

interface outgoing-handler {
    use types.{request, response, error-code, request-options};

    handle: func(request: request, options: option<request-options>) -> result<response, error-code>;
}

world interfaces {
    import incoming-handler;
    import outgoing-handler;

    export incoming-handler;
    export outgoing-handler;
}