Openvidu server API REST with fetch - ajax

Question

I start up KMS+OPENVIDU server with docker. Everything works nice with web component when i use JQ ajax:
For example (this works fine):
$.ajax({
type: "POST",
url: OPENVIDU_SERVER_URL + "/api/sessions",
data: JSON.stringify({ customSessionId: sessionId }),
headers: {
"Authorization": "Basic " + btoa("OPENVIDUAPP:" + OPENVIDU_SERVER_SECRET),
"Content-Type": "application/json"
},
success: response => resolve(response.data.id),
error: (error) => {
if (error.status === 409) {
resolve(sessionId);
} else {
console.warn('No connection to OpenVidu Server. This may be a certificate error at ' + OPENVIDU_SERVER_URL);
if (window.confirm('No connection to OpenVidu Server. This may be a certificate error at \"' + OPENVIDU_SERVER_URL + '\"\n\nClick OK to navigate and accept it. ' +
'If no certificate warning is shown, then check that your OpenVidu Server is up and running at "' + OPENVIDU_SERVER_URL + '"')) {
location.assign(OPENVIDU_SERVER_URL + '/accept-certificate');
}
}
}
})
If i put fetch (native javascript) :
var myPromise = fetch(this.ovServerUrl + '/api/sessions', {
method: 'POST',
// mode: 'cors',
// credentials: 'same-origin',
// redirect: 'follow',
body: JSON.stringify(
{ customSessionId: sessionId }
),
headers: {
'Content-Type': 'application/json',
'Authorization': 'Basic ' + btoa('OPENVIDUAPP:' + this.ovSecret)
}
})
return myPromise.then(response => {
console.log('return resolve !response', response)
console.log('return resolve !response.data.id! ', response.data.id)
return response.id
})
I got response but without response.id .
Looks like :
body: (...)
bodyUsed: false
headers: Headers {}
ok: true
redirected: false
status: 200
statusText: ""
type: "cors"
url: "https://MY_DOMAIN:4443/api/sessions"
Any suggestion ?