Web Reference: I found that configuring a named HttpClient in my Startup.cs and using header propagation of the Cookie header worked perfectly. It also avoids all the concerns about proper disposition of your handler and client. Cookie management with HttpClient in C# is essential for maintaining session state and handling authentication across HTTP requests. The HttpClient class works with CookieContainer to automatically handle cookies, but you can also manually manipulate them when needed. HTTP session data is passed between the client and server in the cookie header of the request or the response. The server sends cookies to the client in the Set-cookie header of the response and the WinHTTP API resends the server cookie to the server in the cookie header of the request. The cookie handling specifications, described in rfc 2109 (HTTP State Management Mechanism), are implemented by default in WinHTTP. Recent cookie handling specifications, described in rfc 2964, are not supported by WinHTTP.
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