510 Error Code Explained
Further extensions to the request are required for the server to fulfill it.A mandatory extension policy in the request is not
accepted by the server for this resource.
Why it occurs
The server must identify all mandatory extension declarations (both hop-by-hop and end-to-end); the server MAY ignore optional declarations without affecting the result of processing the HTTP message, and examine all extensions identified to determine if they are supported for this message. If not, respond with a 510.
Fixing 510 error code
This is a type of HTTP error. If you are registered with 100pulse, your site will be monitored and you will be intimated by an email or a short message service when 510 status code error occurs.