Maybe file, which you tried send to the browser, is very huge? In my opinion, it is not good practic to load whole file to the array. Much better print line by line or use Tie::File - a Perl module for access to the file via array.

Also, I suggest you to look at apache error log for more detailes and HTTP headers (you can use MozillaFirefox with special extension 'Live HTTP headers') to be sure that all HTTP headers are correct.