Nginx returns “Server” header, which exposes whether we use Nginx as the web server to the client.

In order to hide that, we might have to build nginx from source and use it.

vi src/http/ngx_http_header_filter_module.c

static char ngx_http_server_string[] = "Server: Subu" CRLF;
static char ngx_http_server_full_string[] = "Server: Subu" CRLF;

After rebuilding nginx,