I think the statistics are entirely irrelevant now -- if they were ever relevant in the first place. Almost everything serious runs behind some sort of proxy,

I think the statistics are entirely irrelevant now -- if they were ever relevant in the first place. Almost everything serious runs behind some sort of proxy, and those proxies often front for heterogeneous back-end systems, and even those back-ends might offload some of their logic to other systems. There are too many interweaved layers in complex web services, and too many parts that can be (and routinely are) put together in too many different ways. The identity of the front-end is interesting only in a rather attenuated sense, and it can usually be trivially swapped out for another.