Flate Compression Filter

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We use the zlib library to compress and uncompress data.

From the zlib homepage:

"gzip" is the gzip format, and "deflate" is the zlib format. They should probably have called the second one "zlib" 
instead to avoid confusion with the raw deflate compressed data format. While the HTTP 1.1 RFC 2616 correctly points to 
the zlib specification in RFC 1950 for the "deflate" transfer encoding, there have been reports of servers and browsers that 
incorrectly produce or expect raw deflate data per the deflate specficiation in RFC 1951, most notably Microsoft. So even though 
the "deflate" transfer encoding using the zlib format would be the more efficient approach (and in fact exactly what the zlib 
format was designed for), using the "gzip" transfer encoding is probably more reliable due to an unfortunate choice of name on the 
part of the HTTP 1.1 authors.
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