Error codes

411

Length required

What it means

The server needs a Content-Length header to accept the upload or form, and the client did not send one.

Common causes

• An old client or script sending a chunked request
• A proxy stripping the header

How to fix it

1. Try another browser or the site's own app.
2. Turn off the proxy or VPN and retry.
3. If you write the client, send a Content-Length or use chunked encoding the server accepts.