print "Content-type:text/html\n\n";
\n\n is the incorrect header terminator. \r\n\r\n is usually closer, but I admit that I don't know the proper set of characters off-hand, because I never send them directly.
It doesn't matter. You are not sending them directly to the browser. There's still a webserver between the CGI scipt and the browser, and this one fixes up the output from the CGI script, it even changes/adds headers.

Bare newlines are just fine.

In reply to Re^3: get parameter from html page by bart
in thread get parameter from html page by pritoshpandey

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