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I have a primary web app with authentication on example.com, and I have a secondary app with authentication on subdomain.example.com

I want the 2nd app to be integrated with the first one. So once a user registers and logs in, s/he doesn't have to register/log in again.

It is possible to send a post request, but this won't generate the cookies in user's browser...

How can I do that?

Thanks

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1 Answer 1

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You're able to set a cookie so that it works on all subdomains (www, subdomain, etc.). See Basics of Cookies in ASP.NET:

By default, cookies are associated with a specific domain. For example, if your site is www.contoso.com, the cookies you write are sent to the server when users request any page from that site. (Except for cookies with a specific path value, as I explained in the section immediately preceding.)

You can also use the Domain property to create a cookie that can be shared among multiple subdomains. For example, set the domain as follows:

Response.Cookies("domain").Value = DateTime.Now.ToString
Response.Cookies("domain").Expires = DateTime.Now.AddDays(1)
Response.Cookies("domain").Domain = "contoso.com"

The cookie will then be available to the primary domain as well as to sales.contoso.com and support.contoso.com.

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