Assistance requested with HTTPS Response Redirect - VMware Platform Services Controller

3) It has become obvious that I need to find an authoritative informational source detailing the components (again, terminology?) available within each section of the HTTP space. For example, [HTTP::host] is apparently not a valid component of an HTTP_RESPONSE (or so said the iRule checker), while [IP::server_addr] is. However, [HTTP::host] is valid within an HTTP_REQUEST. As you can gather, it is necessary to understand all of the HTTP "parts" (such as REQUEST, RESPONSE, CLIENT_ACCEPT, and so on) and then what components (or "variables," although I believe this is a misnomer in this context) are available within each "part."

Would someone please be able to provide information (link, title, etc.) regarding such an authoritative source to explain all the "things" iRules can work with?