You've already printed the header. This means you are getting two headers.
If you want to redirect, you have to only print the redirect header.
Why are constructing your html with perl? You could make your setup infinitely better by turning this script into two parts. First, put your login form in a static html page and then have your cgi script do the validating and redirecting.
For example, you go to login.html which you put your username/password in. When you submit your form, you go to cgi-bin/login.cgi which authenticates your credentials and redirects to myview.cgi.
Also, how is your myview.cgi authenticating? Can I bypass your security by going staight to myview.cgi?
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