Articles/HTTP

HTTP 411 Length Required — What It Means

What HTTP status code 411 Length Required means, when servers return it, and how to handle it correctly.

Published September 24, 2026

HTTP 411 Length Required — The server refuses to accept the request without a defined Content-Length.

Key points

  • Mostly seen with older clients or specific server configurations that reject chunked transfer encoding
  • Resolved by ensuring the client sends a proper Content-Length header
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