Single Model serving / Authorino Error 401 - Unauthorized

Issue

After deploying a model server with Authorino token configured with the Bearer token inside the payload, you can face a HTTP 401 - unauthorized error

Example of request :

curl -H "content-type:application/json" \
    -H "Authorization: Bearer MY_TOKEN" \
-v https://{MODEL_ENDPOINT}/v1/chat/completions \
-d '{"model":"granite-2b","messages":[{"role":"system","content":"You are an assistant that speaks like Yoda."},{"role":"user","content":"Write a poem about fruits"}],"max_tokens":4000,"stream":false}'

Example of output :

* Host MODEL_ENDPOINT:443 was resolved.
* IPv6: (none)
* IPv4: xx.xx.xx.xx
*   Trying xx.xx.xx.xx:443...
* schannel: disabled automatic use of client certificate
* Connected to {MODEL_ENDPOINT} (xx.xx.xx.xx) port 443
* using HTTP/1.x
> POST /v1/chat/completions HTTP/1.1
> Host: MODEL_ENDPOINT
> User-Agent: curl/8.11.0
> Accept: */*
> content-type:application/json
> Authorization: Bearer TOKEN
> Content-Length: 195
>
* upload completely sent off: 195 bytes
< HTTP/1.1 401 Unauthorized
< content-length: 0
< date: Wed, 02 Apr 2025 11:59:56 GMT
< server: istio-envoy
< www-authenticate: Bearer realm="kubernetes-user"
< x-envoy-upstream-service-time: 31
< x-ext-auth-reason: not authenticated
<
* Connection #0 to host MODEL_ENDPOINT left intact