Systems and methods operate to verify the origin of page requests. The systems and methods use a client identification value that may be sent from a client to a server. The server uses the client identification value to determine that the origin of the request matches the origin of previous requests so that personalized or other private data is not improperly sent to the wrong client. One aspect of the systems and methods includes creating the client identification value on the client and sending the client identification value to a server. The client identification value may then be compared in subsequent requests to the server to verify that the subsequent request comes from the same origin.