Error 431, while accessing mock API

HI I am using blizrock/kong-oidc-keycloak dockerfile opensource for the installation of kong.
Also i am using keycloak as IdP. Testing an Authorization flow, i am accessing in incoginito chrome brower http://IP:8000/mock

it is showing error :
" This page isn’t working

If the problem continues, contact the site owner.

Anyone please help me if you find anything

The error, 431 Request Header Fields Too Large, might be addressed via this setting to increase the allowed header size in the request.

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