You can set headers via the CustomHeader option. The Content-Length header is set by Hiawatha for static files. You can of course add headers, including the Content-Length header via a CGI script.
malcolm
21 April 2013, 18:30
Thank You Hugo. Your right, i see now content-lenght header, I do not know how I missed it, probably because I had images served by varnish from cache. Thanks for the best webserver ever