Issue plesk nginx SSL/TLS access error 502 POST /checkout/ HTTP/2.0

[duaatahli]

Hi
I've woocommerce website.
I'm running an android application on this website
when I proceed to checkout page from the app, the checkout page keeps loading and I got the error 502 POST /checkout/ HTTP/2.0 nginx SSL/TLS access.
I contacted with woocommerce and the application support, they said every thing is working fine for them and the problem might be from the hosting
how can we solve this problem as I'm not a technical in these issues.
Best Regards