DialogFlow CX - Webhook status TIMEOUT_WEB

[SDDEv]

Good morning dear members of the community.

I have the problem with DialogFlow CX that when my bot must make a query with the webhook I receive the error
"webhookStatuses": [
{
"code": 4,
"message": "Error calling webhook 'https://mydomain/api/dialogflow/': State: URL_TIMEOUT, Reason: TIMEOUT_WEB"
}
],

Months ago it worked perfectly, but now I don't understand why that happens.
with postman it works, but from the request with dialogflow you receive this error.

and from another platform when making the same request if it works.

with postman.