The new data source implementation runs a single GET for the whole range
specified and lends the body input_stream for the upper input_stream's
get()-s. Eventually, getting the data from the body stream EOFs or
fails. In either case, the existing body is closed and a new GET is
spawn with the updater Range header so that not to include the bytes
read so far.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
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