Find RFC 2616 here. The controls with the yellowish background are supplied with a help-function. Just press Control + a mouse click, and a new browser window is opened with the RFC at the right chapter...

I also added the HTTP extention WebDAV, and P3P so there are some extra Methods, Headers and Status-codes,

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HTTP Request
Request-Line HTTP/1.1
Add header
Headerlist
Del header
Body
Action

HTTP Response
Status
Headers
Body
Action