class Excon::Connection

def detect_content_length(body)
  if body.is_a?(String)
    if FORCE_ENC
      body.force_encoding('BINARY')
    end
    body.length
  elsif body.respond_to?(:size)
    # IO object: File, Tempfile, etc.
    body.size
  else
    begin
      File.size(body) # for 1.8.7 where file does not have size
    rescue
      0
    end
  end
end