This is the message I get when trying to log into my doll on the French server or if I try to leave a message at the forums.

Length Required
A request of the requested method POST requires a valid Content-length.

When I did a search for the second line, this is what I found:

Fixing the “411 Length Required” Error
The HTTP 411 Length Required error means the server rejected your POST request because it did not receive a valid Content-Length header specifying the size of the request body Runebook.dev+1.

Why it happens
The server expects the Content-Length header to tell it how many bytes are in the request body.

If you send a body but forget to set Content-Length, or set it incorrectly, the server will return 411 Runebook.dev+1.

If you send no body at all, the server may still require Content-Length (often set to 0) Stack Overflow.

Some servers reject chunked encoding if they require Content-Length

It goes on to show how to fix it but it had a lot of steps that is over my geeky head.