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SEO Wiki · Technical SEO

HTTP status codes

Author: SEO Specialist Published

Definition

HTTP status codes — An HTTP status code is the server’s numeric response telling the browser and crawler whether a request succeeded, was redirected or failed.

Quick answer

200 — OK; 301/308 — permanent move; 302/307 — temporary; 404 — not found; 410 — gone for good; 503 — temporarily unavailable (maintenance).

What matters for SEO

  • Permanent redirects (301, 308) are a strong signal for canonical selection.
  • Avoid soft 404s: non-existent pages returning 200.
  • 503 with a Retry-After header is the right response for planned maintenance.

Sources

  1. How HTTP status codes, and network and DNS errors affect Google Search — Google Search Central
→Indexing→

Canonical

A canonical URL is the preferred version of a page among a set of duplicate or near-identical pages, declared with the <link rel="canonical"> element.

Crawl budget

Crawl budget is the number of URLs a crawler can and wants to crawl on a site in a given period.

Indexing

Indexing is the process in which a search engine analyses a crawled page and stores it in its index, from which it can be shown in results.

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