Multiple & SubDomain's cookie in asp.net Core Identity

Question

I have a webpage which uses multiple URLS for the same application:

for example: *.MyWebPage.com.au *.YourWebPage.com.au

So it will use subdomains on

Answer 1

Addition to @michael's answer: How to "handle the deletecookie event, adding options.Domain = RemoveSubdomain(context.Request.Host.Host)": just add

options.Domain= RemoveSubdomain(context.Request.Host.Host);

before

    ConcreteManager.DeleteCookie(context, key, options);

in

CookieManager.DeleteCoockie(..){..};

And don't forget to call CookieManager.DeleteCoockie on logout!

PS Also, if you need to be able to login both on subdomain.example.com and on example.com - you need to modify AppendResponseCookie(..){..}, or you will get only TLD (.com/.ru etc) here