411
Length Required
Client errors (4xx)·RFC 9110
What 411 means
The server requires a Content-Length header, which was missing.
Add a valid Content-Length header to the request and resend.
Client errors (4xx)
The request contains an error from the client — bad syntax, missing auth or a wrong URL.
Other 4xx codes
400Bad Request401Unauthorized402Payment Required403Forbidden404Not Found405Method Not Allowed406Not Acceptable407Proxy Authentication Required408Request Timeout409Conflict410Gone412Precondition Failed413Content Too Large414URI Too Long415Unsupported Media Type416Range Not Satisfiable417Expectation Failed418I'm a teapot421Misdirected Request422Unprocessable Content423Locked424Failed Dependency425Too Early426Upgrade Required428Precondition Required429Too Many Requests431Request Header Fields Too Large451Unavailable For Legal Reasons
FAQ — 411
What does HTTP 411 mean?
411 Length Required: The server requires a Content-Length header, which was missing. Add a valid Content-Length header to the request and resend.
Which class does status code 411 belong to?
411 is a Client errors (4xx) code. The request contains an error from the client — bad syntax, missing auth or a wrong URL.
Where is the 411 code defined?
Status code 411 is defined in RFC 9110 and is part of the IANA HTTP Status Code Registry.