Request for Comments (RFCs): What they are and how to keep up

# What RFCs are

Request for Comments (RFCs) are the official documents that define internet standards, protocols, and procedures. They include foundational specifications used across the web stack: HTTP, TCP, IP, DNS, and TLS. The Internet Engineering Task Force (IETF), founded in 1986, is the primary organization behind RFC creation and maintenance.

# Practical RFCs to know now

• RFC 6648 — Deprecating the "X-" Prefix: recommends stopping the use of x- prefixes for custom HTTP headers.
• RFC 8288 — Web Linking: specifies how to provide link relations in HTTP responses to offer navigation and rich metadata.
• RFC 9110 — HTTP Semantics: covers HTTP request and response semantics, including verb usage (see Section 9.3 for verbs).
• RFC 9113 — HTTP/2: details HTTP/2 rules such as header keys must be lower case (Section 8.2).
• RFC 9114 — HTTP/3: repeats the lower-case header requirement for HTTP/3 (Section 4.2).

• RFC 9745 — The Deprecation HTTP Response Header Field: provides a header to tell clients an endpoint is deprecated and includes a future date/time. Works alongside RFC 8288 for linking to deprecation info.
• RFC 10008 — The HTTP QUERY Method: introduces a QUERY verb that combines GET semantics with the ability to send a request body for complex, idempotent searches.

# Reuse via implementation gems

• RFC API Problem: an implementation of RFC 9457 (Problem Details for HTTP APIs).
• RFC Web Link: an implementation of RFC 8288 (Web Linking).

Reusing these gems across applications reduces the work required to conform to the specifications and makes behavior consistent across services.

# Tools to read and track RFCs

• RFC Explorer: a graphical node-based interface that links RFCs to related documents and groups material by areas of work. It offers zoom and navigation, though it lacks quick search by RFC number.

• IETF Diff: useful for comparing document revisions to see what changed between versions.
• Pennyworth: an Alfred integration that lets users quickly access the RFC Editor, search, and fuzzy-type to lookup RFC documentation.

# Staying current: syndication

# Bottom line

RFCs define the technical rules the web depends on. Focus on a handful of high-impact documents that affect your work, adopt shared implementations when available, and use the RFC Editor and related tools plus RSS/Atom feeds to keep up with new and changing standards without interrupting your day-to-day development work.