HTTP 411 Length Required

HTTP 411 Length Required indicates a client errors response outcome.

What this status code means

Length Required describes how the server processed the request and what the client should do next.

Who should act first

Client request or identity context is usually the first place to fix.

What to check first

Capture exact request path, method, and headers.
Verify authentication and authorization context.
Validate payload schema and content type.

How it differs from similar codes

HTTP 410 Gone — full guide
HTTP 412 Precondition Failed — full guide

Reference and next step

Specification: RFC 9110.

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