What Is a 404 Error?
A 404 Error is a web server response that indicates the requested page or resource cannot be found at the supplied URL. The server is reachable, but the address does not match an available resource. A missing page, deleted content, or mistyped URL can trigger this response.
Quick Facts About 404 Error
Category
HTTP response status
Used for
Identifying unavailable URLs
Common confusion
Server outage or access restriction
Also called
404 Not Found, HTTP 404
Often discussed with
Technical SEO, SEO Audits
Key Takeaways About 404 Error
- The server responds, but the requested resource is unavailable.
- Broken links and changed URLs commonly lead to 404 responses.
- A 404 Error is not the same as a server outage.
How 404 Error Works
A 404 Error occurs when a browser requests a URL that the web server cannot match to an available page or file. The server remains reachable, so the response differs from a connection failure or a permission response. Deleted pages, incorrect links, and changed URL slugs can all produce this result.
Related glossary terms: Crawl Error, Redirect Chain, Canonical Tag.
Technical SEO checks identify these responses through crawlers, browser testing, and Search Console reports. A valid 404 response can be appropriate when content has been permanently removed without a suitable replacement. If a valuable page moved to a new address, a relevant redirect can guide visitors and search engines to the replacement. The correct action depends on the page history, links, and intended destination.
Expert Note
When we review 404 Errors, we trace the requesting URL, its internal links, and any recent site changes. We then decide whether the response is appropriate, whether a relevant replacement exists, or whether the site needs a redirect or link correction.
404 Error in Practice: A Real-World Example
A Geelong service page may return a 404 Error after its URL slug changes during a website update. Technical SEO work checks old links and search references, then restores the page, corrects the links, or redirects the old address when a suitable replacement exists.
Related Services
Related Terms
Crawl Error
A crawl error is a problem that prevents a search engine crawler from accessing or processing…
Redirect Chain
A Redirect Chain is a sequence of URL redirects where one redirect sends a visitor or…
Canonical Tag
A Canonical Tag is an HTML link element that identifies the preferred URL for substantially similar…
Index Coverage
Index Coverage is a report of which website URLs a search engine has stored in its…
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