The HTTP 411 error occurs because the server requires the Content-Length header, which specifies the size of the data in the request. This header is missing, causing the server to reject the request. The error ensures data integrity by confirming the data size beforehand.
Client sends a POST or PUT request without a Content-Length header.
Misconfigured server rejecting requests without explicit Content-Length headers.
Client uses chunked transfer encoding without properly using the Transfer-Encoding header.
Programming errors in client application where Content-Length is not calculated or set.
# Request example curl -X POST https://sandbox.oxylabs.io/ -H 'Accept: text/html' -H 'Accept-Encoding: br' -H 'User-Agent: Mozilla/5.0'
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Ensure that the Content-Length header is included in the HTTP request.
Verify that the Content-Length header value correctly matches the size of the request body.
Use tools or libraries that automatically handle the Content-Length header when building HTTP requests.
Check server configurations to confirm that it is not erroneously requiring a Content-Length header for GET or HEAD requests.
# Response example HTTP/1.1 411 Length Required Content-Type: text/html; charset=UTF-8 Content-Length: 49411 Length Required
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