Currently, mobile devices are the most popular
pervasive computing device, and they are becoming the primer way for Web access. Energy is a critical resource in such pervasive
computing devices, being network communication one of the primary energy consuming operations in mobile apps. Indeed, web-based communication is the most used, but also energy demanding. So, mobile web developers should be aware of how much energy consumes the different web-based communication alternatives. The goal of this paper is to measure and compare the
energy consumption of three asynchronous Web-based methods in mobile devices. Our experiments consider three different Web applications models that allow a web server to push data to a browser: Polling, Long Polling and WebSockets. The obtained
results are analyzed to get more accurate understanding of the impact in energy consumption of a mobile browser for each
of these three methods. The utility of these experiments is to show developers what are the factors that influence the energy consumption when different web-based asynchronous communication
is used. With this information mobile web developers
could reduce the power consumption of web applications on
mobile devices, by selecting the most appropriate method for
asynchronous server communication.