#18 Accept Content-Encoding: gzip, deflate

[EJP]

Accept Content-Encodings of gzip and deflate, and provide suitable InputStreams (GZIPInputStream or InflaterInputStream) when they are found.
This will reduce transmission times and bandwidth requirements when downloading or parsing text resources.

Also provide a GZIPInputStream if the resource is already GZIPPED as determined from its mime-type, and apply a GZIPOutputStream when downloading to preserve that. Sitemap index files have been found containing sitemapNN.xml.gz files for example.