4xx Client error
HTTP 408 Request Timeout
The server didn’t receive a complete request within the time it was prepared to wait, and closes the connection. The client may send the request again. It is about the client being slow to send; 504 is a gateway waiting for a slow server.
Defined in RFC 9110, section 15.5.9(opens in a new tab)
//_01 Uptime checks
Is 408 up or down for a monitor?
Uptimecheck HTTP monitor
Default settings
Down. It is outside the default 200–399 range, so a monitor reports an outage once a second check confirms it. If 408 is the answer you expect from that URL, add it to the monitor’s expected status codes.
Is it down? checker
Free, at /is-it-down/
Up. The checker counts any answer below 500 as the site answering: a 408 comes from a server that is running.
//_02 Causes and fixes
Why you see 408 and what to do
Typical causes
- Slow uploads or a poor connection.
- An idle keep-alive connection that the server closes.
If you run the site
- Check the server’s client body and header timeouts if uploads on slow connections fail.
If you’re a visitor
- Try again, ideally on a better connection.
Know the moment your site stops answering as it should
An Uptimecheck monitor requests your page as often as every minute, checks the status code against the ones you expect, confirms a failure with a second check and then alerts you.
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Questions
What does HTTP 408 mean?
The server didn’t receive a complete request within the time it was prepared to wait, and closes the connection. The client may send the request again. It is about the client being slow to send; 504 is a gateway waiting for a slow server.
Does an uptime monitor count 408 as down?
Down. It is outside the default 200–399 range, so a monitor reports an outage once a second check confirms it. If 408 is the answer you expect from that URL, add it to the monitor’s expected status codes.
Downtime is obsolete.
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