411 Length Required

HTTP 411 status code indicates that a request lacks a Content-Length header.

Content-Length HTTP header contains the size of the request body (in bytes) and should be sent with all requests that have a request body. Typically, these are POST, PUT, and PATCH requests.

Content-Length: 42

Content-Length header is ignored when the data Transfer-Encoding header is present.

Try it yourself

Send a POST request to example.com with an empty body and without a Content-Length header, and you will receive a 411 Length Required status code:

curl --verbose -X POST https://example.com

Try resending the same request with a Content-Length header, and you will get a 200 OK response:

curl --verbose -X POST -H 'Content-Length: 0' https://example.com

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