A hierarchical memory request stream arbitration technique merges coherent memory request streams from multiple memory request sources and arbitrates the merged coherent memory request stream with requests from a non-coherent memory request stream. The adapter plate has a through opening which in the connected state is flush with the passage opening in the flange part and together with same has a through opening constituting a flow opening with the same and an annular seal and in the connected state effective between the adapter plate and the flange part for sealing off the through opening from the outside. The dynamic content router directs the web server plug-ins to forward the request to the appropriate application server.