---
type: Glossary Term
title: "RFC 9110 (HTTP Semantics)"
description: "The current IETF standard defining HTTP semantics: methods, status codes, headers."
resource: "https://prerendering.com/glossary/rfc-9110"
tags: [standards, glossary]
timestamp: 2026-05-11T00:00:00Z
---

# RFC 9110 (HTTP Semantics)

The current IETF standard defining HTTP semantics: methods, status codes, headers.

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.

## Related

- [HTTP Status Codes for SEO and Crawlers](/blog/http-status-codes-for-seo-and-crawlers.md)