HTTP Status Codes
HTTP 411 Length Required
411 Length Required
The server refused to accept the request because it requires a valid Content-Length header.
Error AtlasError Documentation and ResolutionObserved message
411 Length Required
Why it happens
- The client omitted the Content-Length header for a request body where the server expects it.
- The request body handling is malformed or incompatible with the server's expectations.
- A proxy or client library stripped or failed to calculate Content-Length.
How to fix it
- Ensure the client sends a correct Content-Length header when required.
- Review how the request body is being streamed or serialized.
- Check whether an intermediary or library is rewriting the request headers incorrectly.
Official reference
MDN: 411 Length RequiredRelated errors
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