Rewrite/redirect a POST with nginx?

gistfile1.txt

    server {
        listen 80;
        server_name blog.akbuntu.local;

        location / {
            default_type text/html;
            root /home/amiri/roosterpirates/Ripe/RoosterPirates-Web/root/yar;
            autoindex on;
            expires 30d;
        }

        ...

        location /comments {
            rewrite ^/comments(.*)$ http://write.akbuntu.local/comments$1;
        }
    }