class HTTPClient::Session

def set_header(req)
  if @requested_version
    if /^(?:HTTP\/|)(\d+.\d+)$/ =~ @requested_version
      req.http_version = $1
    end
  end
  if @agent_name && req.header.get('User-Agent').empty?
    req.header.set('User-Agent', "#{@agent_name} #{LIB_NAME}")
  end
  if @from && req.header.get('From').empty?
    req.header.set('From', @from)
  end
  if req.header.get('Accept').empty?
    req.header.set('Accept', '*/*')
  end
  if @transparent_gzip_decompression
    req.header.set('Accept-Encoding', 'gzip,deflate')
  end
  if req.header.get('Date').empty?
    req.header.set_date_header
  end
end