Client error

404 404 Not Found

The URL does not exist on this server. A handful of 404s is normal on any site; a sudden spike after a deploy means a broken URL structure.

Common causes

Deleted pages, changed permalinks, mistyped links, old links from other sites.
A migration where the URL pattern changed and no redirect map was created.

How to fix it

Redirect the important old URLs to their new equivalents with 301.
Use 410 for content that is intentionally gone forever, so search engines drop it faster.
Keep a helpful 404 page with search and popular links — but always with a real 404 status.

See what a site actually returns

Run a live check and read the real status code, headers and timings.

Check a website

Other status codes

200 OK 201 Created 204 No Content 206 Partial Content 301 Moved Permanently 302 Found 303 See Other 304 Not Modified 307 Temporary Redirect 308 Permanent Redirect 400 Bad Request 401 Unauthorized 403 Forbidden 405 Method Not Allowed 408 Request Timeout 410 Gone 413 Payload Too Large 418 I'm a Teapot 429 Too Many Requests 451 Unavailable For Legal Reasons 500 Internal Server Error 501 Not Implemented 502 Bad Gateway 503 Service Unavailable 504 Gateway Timeout 507 Insufficient Storage 508 Loop Detected 521 Web Server Is Down 522 Connection Timed Out 523 Origin Is Unreachable 525 SSL Handshake Failed