Mormot 1.18 (stable): https://github.com/synopse/mORMot/blob/master/SynCrtSock.pas
Mormot 2: https://github.com/synopse/mORMot2/blob/master/src/net/mormo...
https://synopse.info/files/html/api-1.18/SynCrtSock.html#THT...
https://synopse.info/files/html/Synopse%20mORMot%20Framework...
They have multiple client implementations. You can pick the one you like (THTTPClientSocket, TWinHTTP, TWinINET, TCurlHTTP, TWinHttpWebSocketClient).