Remarks

The currently relevant HTTP/1.1 RFCs are:

• 7230: Message Syntax and Routing
• 7231: Semantics and Content
• 7232: Conditional Requests
• 7233: Range Requests
• 7234: Caching
• 7235: Authenticaion
• 7239: Forwarded HTTP Extension
• 7240: Prefer Header for HTTP

There’s also the following informational RFCs:

• 7236: Authentication Scheme Registrations
• 7237: Method Registrations

And the experimental RFC:

• 7238: The Hypertext Transfer Protocol Status Code 308 (Permanent Redirect)

Related protocols:

• 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)
• 4791: Calendaring Extensions to WebDAV (CalDAV)