Verify that MarkLogic Server is up and accepting requests.
If MarkLogic Server is available, this request returns response code
If security has not yet been installed, no authentication is required.
If security has been installed, digest authentication is required, but
no privilege checking is done.
This request must be directed to the MarkLogic Server Admin Interface
on port 8001. For example:
curl --anyauth --user user:password -X HEAD -i \
==> If MarkLogic Server is available, headers similar to the following
HTTP/1.1 200 OK