location @s3 {
expires max;
proxy_pass https://n.s3-us-west-2.amazonaws.com;
proxy_set_header Host "n.s3-us-west-2.amazonaws.com";
proxy_set_header Authorization "";
proxy_hide_header X-Amz-Id-2;
proxy_hide_header x-amz-request-id;
add_header Last-Modified "";
proxy_hide_header ETag;
proxy_redirect off;
}

?