Keycloak behind Kong ingress Controller

Configuring the server
1

Hello,

I have configured successfully keycloak and kong using helm chart so kong will be the ingress controller of Keycloak. For the rest API part work perfectly. Now We have developed web application and used the keycloak login page. After successful login Kong receives a 302 (the normal process) with the location pointing to the new web application domain. But the ingress controller shows the following message

{
  "message":"An invalid response was received from the upstream server"
}

I have tried several plugin bit with no success. Anybody has a hint on how to configure the redirect in Kong or should we move a more classic ingress like Nginx or HAProxy that support more the reverse proxy pattern?

This the keycloak configuration with helm

keycloak:
  image:
    registry: <acr>
    repository: docker/keycloak
    tag: 0.1.0
  global.namespaceOverride: keycloak
  fullnameOverride: keycloak
  replicaCount: 1
  httpRelativePath: "auth/"
  auth:
    adminUser: "admin"
    adminPassword: "admin"
  proxy: "edge"
  service:
    type: ClusterIP
  postgresql:
    enabled: false
  externalDatabase:
    host: <db_url>
    port: 5432
    user: <db_user>
    password: <>
    database: keycloak
  extraEnvVars:
    - name: KEYCLOAK_HOSTNAME
      value: keycloak-dev.<domain>
    - name: KEYCLOAK_PROXY_ADDRESS_FORWARDING
      value: "true"
    - name: KEYCLOAK_LOG_LEVEL
      value: ERROR
    - name: KEYCLOAK_FRONTEND_URL
      value: https://keycloak-dev.<domain>/auth
  ingress:
    enabled: true
    annotations:
      cert-manager.io/cluster-issuer: letsencrypt-prod
    tls:
      - secretName: keycloak-dev.<domain>-tls
        hosts:
          - keycloak-dev.<domain>
    hostname: keycloak-dev.<domain>
    ingressClassName: kong
    pathType: Prefix
    path: /auth
    servicePort: 80
  metrics:
    enabled: true

Kong Helm configuration

plugins:
  namespace: gateway
  kong-oidc-plugin:
    namespace : gateway

kong:
  namespace: gateway
  repository: <acr>/docker/kong:3.0.0
  tag: "3.0"

  proxy:
    annotations:
      service.beta.kubernetes.io/azure-load-balancer-resource-group: <resource_group>
    loadBalancerIP: <static_ip>

  env:
    prefix: /kong_prefix/
    database: "off"

  ingressController:
    enabled: true
    installCRDs: false

  plugins: 
    configMaps:
    - pluginName: oidc
      name: kong-plugin-oidc

Thanks

2

this solved my issues

- name: KONG_NGINX_PROXY_PROXY_BUFFER_SIZE
  value: 160k
- name: KONG_NGINX_PROXY_PROXY_BUFFERS
  value: 64 160k