class Excon::Middleware::Decompress

def request_call(datum)
  unless datum.key?(:response_block)
    key = datum[:headers].keys.detect { |k| k.to_s.casecmp?('Accept-Encoding') } || 'Accept-Encoding'
    datum[:headers][key] = 'deflate, gzip' if datum[:headers][key].to_s.empty?
  end
  @stack.request_call(datum)
end