https://learn.microsoft.com/en-us/dotnet/api/system.net.httpwebrequest.getrequeststream?view=netframework-4.8.1&viewFallbackFrom=netcore-3.1&WT.mc_id=DT-MVP-5004591
HttpWebRequest.GetRequestStream Method (System.Net) | Microsoft Learn
Gets a Stream object to use to write request data.
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