In addition to the excellent comments by
dws above, I would only add that one other limitation of the Cookie mechanism of which you should be aware is that it is not possible to set
and retrieve a Cookie within a single HTTP request - I only add this comment as it is not clear that you are aware of this from the code snippet provided.
In the article from merlyn to which a link has been provided, this issue was addressed by redirecting the client browser back upon the script, with the appropriate Set-Cookie header, if the required cookie did not already exist. The relevant section of code follows:
=25= param("_cookiecheck", 1); # prevent infinite loop
=26= print redirect (-cookie => $cookie, -uri => self_url());
It may also be useful to read further about Cookies from the appropriate RFC document.
perl -e 'print+unpack("N",pack("B32","00000000000000000000000111011000")),"\n"'
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