eladmarg 

A drop-in HttpMessageHandler backed by a bundled, statically-linked libcurl + OpenSSL native bridge. Gives HttpClient modern TLS 1.2/1.3 on hosts whose Schannel cannot — most notably Windows Server 2012 R2 —... More information

IHttpClientFactory / dependency-injection integration for CurlHttpClient — AddCurlHttpClient(...) to register the libcurl+OpenSSL-backed HttpMessageHandler.