成员的完整列表，这些成员属于 neforce::http::http_client::config,包括所有继承而来的类成员

buffer_size	neforce::http::http_client::config
connect_timeout	neforce::http::http_client::config
default_headers	neforce::http::http_client::config
follow_redirects	neforce::http::http_client::config
keep_alive	neforce::http::http_client::config
max_redirects	neforce::http::http_client::config
max_response_size	neforce::http::http_client::config
proxy_host	neforce::http::http_client::config
proxy_port	neforce::http::http_client::config
receive_timeout	neforce::http::http_client::config
send_timeout	neforce::http::http_client::config
user_agent	neforce::http::http_client::config
verify_ssl	neforce::http::http_client::config