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Predicate encoding_filter/3
 http:encoding_filter(+Encoding, +In0, -In) is semidet[multifile, library(http/http_stream)]
Install a filter to deal with chunked encoded messages. Used by library(http_open).
 http:encoding_filter(+Encoding, +In0, -In) is semidet[multifile, library(zlib)]
Act as plugin for library(http/http_open) for processing content with Content-encoding: gzip