连接拒绝：在KTOR中提出请求时没有更多信息

Question

 suspend fun callback(code: String, baseRoute: String): String {
        val body = Parameters.build {
            append("code", code);
            append("redirect_uri", baseRoute + REDIRECT);
            append("grant_type", "authorization_code");
        }

        println(body.toString())
        val response: HttpResponse = client.post("${BASE_URL}/api/token") {
//            contentType(ContentType.Application.FormUrlEncoded)
            headers {
                append("Authorization", "Basic ${encodedClientCredentials()}")
            }
            setBody(FormDataContent(body))
        }
        return response.toString();
    }

路由：

        get("/token") {
            val baseRoute = call.request.headers["baseRoute"];
            val code = call.request.headers["code"];
            if (baseRoute == null || code == null) {
                call.respond(HttpStatusCode.BadRequest, "Error");
            } else {
                call.respondText(api.callback(code, baseRoute));

            }
        }

当我向 /token提出请求时，我会得到

[eventloopgrouprouxy -4-1] debug ktor.application-毫无根据：获取 - /token。异常类Java.net.ConnectException：连接拒绝：无进一步的信息] java.net.connectException：连接拒绝：没有更多信息

回调方法提出了Spotify API获取令牌的请求。知道为什么会发生这种情况吗？