Apache 2.1 supports TLS upgrade - http://httpd.apache.org/docs-2.1/mod/mod_ssl.html#sslengine
"New in Apache 2.1, SSLEngine can be set to optional. This enables support for RFC 2817, Upgrading to TLS Within HTTP/1.1. At this time no web browsers support RFC 2817."
The only thing I've ever run into in "the wild" that actually does TLS upgrade as a client is CUPS.
Posted by Ben at May 21, 2005 03:22 PMAnd you should buy a proper key. They're super cheap right now. http://www.godaddy.com/gdshop/ssl/turbo.asp?isc=tebssl01
Posted by Jonathan Wilkins at May 26, 2005 01:05 PM