++ Added request options if libcurl has builtin c-ares support:
+ dns_interface, dns_local_ip4, dns_local_ip6 (all libcurl >= 7.33.0)
++ Added request options:
+ expect_100_timeout (libcurl >= 7.36.0)
+ tcp_nodelay
++ Added transfer info:
+ tls_session (libcurl >= 7.34.0), only available during transfer