Sharing Cookies Between Two ASP.NET Core Applications

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This is documented at Sharing cookies among apps with ASP.NET and ASP.NET Core. There is also a Cookie Sharing App Sample available.

In order to share cookies, you create a DataProtectionProvider in each app and using a common/shared set of keys between the apps. 

.AddCookie(options =>
{
    options.Cookie.Name = ".SharedCookie";
    options.Cookie.Domain = "example.com";
    options.DataProtectionProvider =
        DataProtectionProvider.Create(new DirectoryInfo("path-tokeys"));
});

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