Cross-domain communication between a sender domain and a receiver domain includes: receiving, in the receiver domain, a data request from the sender domain, the data request being directed to a designated request processing page in the receiver domain; processing the data request to generate a response; and sending the response to the sender domain, the response being directed to a designated response processing page in the sender domain. Alternatively, cross-domain communication includes receiving, in the receiver domain, a data request from the sender domain, the data request being directed to a designated request processing page in the receiver domain; processing the data request to generate a response; and sending the response to the sender domain, the response being directed to a designated response processing page in the sender domain.