get_cookies rewriting

# I shoulde re-write this:

@cookies = res.headers['Set-Cookie']
@cookies = @cookies.split(" ")[0]

# using get_cookies method, and perhaps Regex:

def get_cookies
  cookies = ""
  if (self.headers.include?('Set-Cookie'))
    set_cookies = self.headers['Set-Cookie']
    key_vals = set_cookies.scan(/\s?([^, ;]+?)=([^, ;]*?);/)
    key_vals.each do |k, v|
      # Dont downcase actual cookie name as may be case sensitive
      name = k.downcase
      next if name == 'path'
      next if name == 'expires'
      next if name == 'domain'
      next if name == 'max-age'
      cookies << "#{k}=#{v}; "
    end
  end

  return cookies.strip
end

# @cookies = res.get_cookies.sub(/;$/, "")
# It's ok?
# p.s I'm newbie in regex