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  $ua->cookie_jar([$cookies])
  # Get/set the HTTP::Cookies object to use.  The default
  # is to have no cookie_jar, i.e. never automatically add
  # "Cookie" headers to the requests.

COOKIES
  Some sites like to play games with cookies.  By default
...

  As you visit sites that send you cookies to keep, then
  the file lwpcookies.txt" will grow.