HTTP 408 Request Timeout
408 Request Timeout means the server timed out waiting for the client to finish sending its request. It points at a slow or stalled connection rather than a problem with the resource. Compliant crawlers generally retry, so occasional 408s are tolerated, but a pattern can indicate network or origin slowness worth investigating.
What 408 means
408 Request Timeout indicates the server did not receive a complete request within the time it was prepared to wait, and it is closing the connection. The cause is on the request side — a slow, stalled, or idle client connection — not the resource itself.
A compliant client may repeat the request without modification. Crawlers generally do retry, so a single 408 rarely matters.
408 patterns and crawl reliability
Isolated 408s are normal background noise: a connection stalls, the server times out, the crawler tries again. The signal to watch for is a pattern — many 408s clustered in time or on a path — which can point at an overloaded origin, slow network conditions, or server timeout values set too aggressively for real-world latency.
Unlike server-side 5xx errors, a 408 is about the request not completing, so diagnosis focuses on connection handling and timeout configuration rather than application logic.
- 408 = server timed out waiting for the request
- Crawlers typically retry; isolated 408s are tolerated
- Clusters of 408s suggest slow connections or tight timeouts
Operator checklist
Treat occasional 408s as transient. Investigate clusters: review server and proxy timeout settings, check origin load, and look for network slowness. Make sure legitimate crawlers are recovering on retry rather than being repeatedly timed out.
How it appears in analytics and logs
A 408 means the server stopped waiting for the client's request to arrive. For crawlers it is a transient failure they typically retry; repeated 408s suggest slow connections, an overloaded origin, or aggressive server timeout settings.
Diagnostic use case
Diagnose 408s a crawler receives, distinguish a transient slow connection from a persistent origin or network problem, and confirm crawlers recover.
What WebmasterID can help detect
WebmasterID can surface 408s crawlers receive, helping you tell a one-off slow connection from a persistent timeout pattern affecting crawl reliability.
Common mistakes
- Setting request timeouts so tight that normal crawler connections fail.
- Treating a single 408 as a serious fault rather than a transient blip.
- Looking only at application logs when 408 is about connection timing.
Privacy and accuracy notes
Status codes carry no personal data. WebmasterID reports 408 patterns for crawler traffic without exposing individual visitors or raw IP addresses.
Related pages
- HTTP 504 Gateway Timeout
504 Gateway Timeout means a server acting as a gateway or proxy did not receive a timely response from the upstream server it needed to reach. Unlike 502 (an invalid upstream response), 504 is specifically about the upstream being too slow or unreachable. Persistent 504s degrade crawl health much like sustained 5xx errors.
- Crawl rate and server load
When crawlers request pages faster than your origin can comfortably serve, load rises. Compliant crawlers respond to 429 and 503 with Retry-After by slowing down, giving you a controlled way to protect the server. Google adjusts crawl rate automatically based on site responsiveness and offers a way to report rate problems.
- Website observability
See timeout responses crawlers receive and the affected paths.
Sources and verification notes
Last reviewed 2026-06-24. Facts are checked against primary/official sources where available; uncertain specifics are marked “Data not yet verified” rather than guessed.