Hans Leidekker (@hans) commented about include/winhttp.h:
#define WINHTTP_OPTION_HTTP_PROTOCOL_REQUIRED 145 #define WINHTTP_OPTION_REQUEST_STATS 146 #define WINHTTP_OPTION_SERVER_CERT_CHAIN_CONTEXT 147 -#define WINHTTP_LAST_OPTION WINHTTP_OPTION_SERVER_CERT_CHAIN_CONTEXT +#define WINHTTP_OPTION_CONNECTION_STATS_V1 150 +#define WINHTTP_OPTION_SECURITY_INFO 151 +#define WINHTTP_OPTION_TCP_KEEPALINE 152
WINHTTP_OPTION_TCP_KEEPALIVE