Codex tools: Log in
https://codex.wordpress.org/FAQ_Installation#How_can_I_get_WordPress_working_when_I.27m_behind_a_reverse_proxy.3F
https://codex.wordpress.org/Function_Reference/is_ssl
https://codex.wordpress.org/Plugin_API/Filter_Reference/pre_comment_user_ip
https://en.wikipedia.org/wiki/X-Forwarded-For