products in Server header field

I wish to know which data are allowed in Server: header-field (HTTP 1.1). 
May i put in an HTTP response "Server: Apache Plone Zope Python" ?
Does "the software used by the origin server to handle the request" include or 
allow each software involved in the answer ? 

References: 
* RFC 2616 section 3.8 Product Tokens
http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.8
* RFC 2616 section 14.38 Server
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.38

Received on Thursday, 1 March 2007 23:21:51 UTC