Quick answer
HTTP status code 411 (Length Required) means: The server requires the request to state its length (Content-Length header). Yes, a client error: the request was wrong or not allowed. Usually the link, the login or the data sent needs to change.
Is it an error?
4xx Client errors
Yes, a client error: the request was wrong or not allowed. Usually the link, the login or the data sent needs to change.
Common causes
- Malformed request, invalid parameters or corrupted cookies
If you are visiting the site
- Update your browser or app
If you run the website
- Validate input and return a clear error message
Frequently asked questions
What does HTTP 411 mean?
HTTP status code 411 (Length Required) means: The server requires the request to state its length (Content-Length header).
Is HTTP 411 an error?
Yes, a client error: the request was wrong or not allowed. Usually the link, the login or the data sent needs to change.
How do I fix a 411 error?
If you are visiting the site: Update your browser or app. If you run the website: Validate input and return a clear error message.
4xx Client errors
HTTP 400 Bad RequestThe server cannot process the request because it is malformed or invalid.HTTP 401 UnauthorizedYou need to log in: authentication is required and was missing or invalid.HTTP 403 ForbiddenThe server understood the request but refuses to give access.HTTP 404 Not FoundThe server cannot find the requested page or file.HTTP 405 Method Not AllowedThe request method (for example POST) is not allowed for this URL.HTTP 406 Not AcceptableThe server cannot return the content in a format the client said it accepts.HTTP 407 Proxy Authentication RequiredYou must first sign in to the proxy server between you and the website.HTTP 408 Request TimeoutThe server waited too long for the client to finish sending the request.HTTP 409 ConflictThe request conflicts with the current state of the resource.