Straight from the CGI Docs (emphasis from doco):

GENERATING A REDIRECTION HEADER
print redirect('http://somewhere.else/in/movie/land');

Sometimes you don't want to produce a document yourself, but simply redirect the browser elsewhere, perhaps choosing a URL based on the time of day or the identity of the user.

The redirect() function redirects the browser to a different URL. If you use redirection like this, you should not print out a header as well.

You should always use full URLs (including the http: or ftp: part) in redirection requests. Relative URLs will not work correctly.

So you have 2 problems:

• You have to do your check before you print any header and then print either the redirect or the standard header
• You should use the full URL (http://foo.com/Welcome.cgi) in the redirect