Navigate back in Safari onBeforeunload event getting error

Hello Community,

Environment: Angular 8 + Typescript

I have a problem when I press back button in safari. onBeforeunload event I am requesting server call to do some operation(close session). For server request I am using windows authentication + kerberos authentication.

I am using sendBecaon for server call. Its working in Chrome, Firefox, Edge and opera browsers. But not working in Safari browser.

Getting 401 error.

I have tried with sendBeacon and normal server call.

Both cases I am getting error.

How can I async server call in onBeforeunload event ?

How Can I solve problem ?

Regards

Naresh