Standards
RFC 9110 (HTTP Semantics)
The current IETF standard defining HTTP semantics: methods, status codes, headers.
Definition
Published 2022, supersedes RFC 7230-7235. Defines what HTTP methods (GET, POST, PUT, DELETE, etc.) mean, what status codes (200, 301, 308, 404, 410, 503) signal, and how headers (Cache-Control, Vary, ETag) behave. Technical SEO depends on correct status code use; misuse (e.g., 200 on missing pages) causes indexation problems.
See also
More in Standards
hreflang
A signal that tells search engines which language and region version of a page to serve.
JSON-LD
JSON-formatted structured data that Google and AI engines extract for entity understanding.
RFC 9309 (Robots Exclusion Protocol)
The IETF standard that formally specifies robots.txt parsing and behavior.
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