HTTP 411 Length Required — What It Means & How to Fix It

The HTTP 411 Length Required status code indicates the server requires the Content-Length header in the request, but it was not provided. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: The server refuses to accept the request without a valid Content-Length header.. This header tells the server the size of the request body in bytes.. The client should add the Content-Length header and retry the request.. Some servers require this for all requests with a body.. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: The request body was sent without a Content-Length header.. Chunked transfer encoding was used but the server requires a known content length.. A proxy stripped the Content-Length header from the request.. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Add a Content-Length header to your request with the correct body size in bytes.. If using chunked encoding, switch to sending the full body with Content-Length.. Check if a proxy is stripping required headers.. Verify your HTTP client library is setting Content-Length automatically.. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our HTTP Status Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.