HTTP 503 Service Unavailable

HTTP 503 Service Unavailable is a server response status indicating that a server cannot handle a request at the moment, often because of maintenance or temporary overload. Unlike a 404, it does not normally mean that the requested page has permanently disappeared. A service business performing planned website maintenance may use an appropriate temporary response while its site is unavailable. The duration and any Retry-After guidance should reflect reality; leaving a site in an error state can still harm visitors and discovery. Owners should investigate recurring 503 errors rather than assuming search engines or customers will wait indefinitely.