``` fun <T> response(req: HttpServerRequ...
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fun <T> response(req: HttpServerRequest): Handler<AsyncResult<T>> = Handler {
        val (statusCode, body) = if (it.succeeded()) 200 to it.result() else 500 to it.cause()
        req.response().let { response ->
            response.setStatusCode(statusCode).write(body?.toString() ?: "null").end()
        }
    }