4xx Client error
HTTP 411 Length Required
The server refuses a request that has no Content-Length header, because it needs to know the size of the body in advance.
//_01 Uptime checks
Is 411 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 411 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 411 comes from a server that is running.
//_02 Causes and fixes
Why you see 411 and what to do
Typical causes
- A client sending a body without a length, for example a POST with chunked encoding to a server that doesn’t accept it.
If you run the site
- Accept chunked request bodies if your clients send them, or document that a length is required.
If you’re a visitor
- Nothing you can change in a browser; contact the site if it persists.
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 411 mean?
The server refuses a request that has no Content-Length header, because it needs to know the size of the body in advance.
Does an uptime monitor count 411 as down?
Down. It is outside the default 200–399 range, so a monitor reports an outage once a second check confirms it. If 411 is the answer you expect from that URL, add it to the monitor’s expected status codes.
Downtime is obsolete.
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