The Gemini Web container conforms to the OSGi Web Applications specification and does not apply default values to the headers of a Web Application Bundle. However, SpringSource dm Server 2.0.x applies default values to certain headers (see Web Application Manifest Processing for details) and so Virgo Web Server 2.1.x modified the behaviour of Gemini Web so that it applied default values consistently with dm Server 2.0.x.
This behaviour is changed as of Virgo Server for Apache Tomcat 3.0. VTS now conforms strictly to the OSGi Web Applications specification.
As a migration aid, which may not be supported in a future release, users may configure the VTS Web Integration Layer to apply default values to the headers of a Web Application Bundle. See "Configuring the Web Integration Layer" in the User Guide for details.