Cannot reproduce?
Try this
/// add to CustomMission class override void OnClientReadyEvent(PlayerIdentity identity, PlayerBase player) { super.OnClientReadyEvent(identity, player); RestApi restApi = CreateRestApi(); restApi.EnableDebug(false); RestContext restContext = restApi.GetRestContext("https://api.cftools.cloud/gamelabs/dz"); restContext.SetHeader("application/json"); restContext.POST_now("/v1/trace", "test"); }