[Auth]Rest Endpoint should carry request when user 'webhook auth'

### Describe the solution you'd like

Auth_mode: POST

Webhook server would get a auth request as follow:
`{
"headers": {
"Accept": "*/*",
"Accept-Encoding": "gzip, deflate, br",
"Connection": "keep-alive",
"Host": "192.168.15.138:8236",
"Postman-Token": "cba8128a-b61a-477d-9c3b-160eb9ebe43a",
"User-Agent": "PostmanRuntime/7.26.8",
"x-request-id": "a5833296-b48d-4d9e-aa68-29f62b21b966"
},
"request": null
}`

We need the path of Rest Endpoint to do Authentication

Can set the path to "request" field?