Applications over HTTP are expected to play its persistently important role in the future heterogeneous networks. The purpose of this study is to analyze emerging characteristics of HTTP traffic which has dramatically changed both in payload and transfer method in the past few years. Beginning with a discussion of well-known models in literature, we emphasize on their applicability in the future networks in this article. Consequently, Attentions are paid to analysis of continued HTTP traffic evolutions. Finally, issues on modeling in growing heterogeneous environments are discussed.