API is not responding with 4xx when it is bad request and 5xx when it is really a temporary issue or technical issue

[matiwinnetou]

API is not responding with 4xx when it is bad request and 5xx when it is really a temporary issue or technical issue.

We shuold try to see if we can prepare the API and make it according to somewhat REST standards since load balancers / proxies such as traefik expect certain contracts.

It could mean having two type of exceptions in the api:

• APICriticalException (5xx)
• APIException (4xx)

and have http handler resolve this properly.