the ability to leverage a publish / subscribe functionality in an application server environment has allowed the storage of cached entries to be stored over multiple clients rather than on a single application server , freeing up valuable resources . however , in this arrangement it is not possible for the originating server to validate shared content originating from client - side storage . the present invention provides a system and method for securing and validating content from asynchronous include request by allowing a subscribing client to set trusted clients from which they will accept content .