When using TTN, you’d use its APIs and/or integrations to handle the data, not some direct POST from a specific gateway. So, it seems you’re not using TTN, which this forum is about? That’s too bad, see https://www.thethingsnetwork.org/forum/t/why-do-you-need-ttn/20040/
On the other hand, https://www.thethingsnetwork.org/u/florentcoste shows you’ve got two gateways connected to TTN?