What is the MaxHeaderBytes length in traefik v2

Hi all,

as we use traefik in k8s with keycloak and its gatekeeper component as security system with a nodejs-express backend, we encounter several 431 errors (request header fields to large). We can exclude our express-server as requests never reach him, so the component blocking the request is either traefik or the keycloak-gatekeeper.
By default it seems that the net/http module defines a const DefaultMaxHeaderBytes = 1 << 20 // 1 MB is about a meg of size. Is this correct or does it have another value? node.js for example has a limit of 8192 bytes.

Any answer is appreciated.