The HTTP protocol supports data compression of network traffic via the Content-Encoding header. Compressing network traffic is beneficial because it reduces the amount of data that needs to be transmitted over the network - and sending fewer bytes obviously takes less time! The tradeoff is that it takes a bit of extra work to decompress the data, but because the bottleneck is nearly always network, HTTP compression should be a win pretty much every time. And when you're dealing with comparatively slow, unreliable networks like the ones used by cell phones, the advantages of compression are even more significant.
Aside: Because most networks are lossy and transfer data in ...
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