Just print something back to the browser periodically while your script is running. Anything will do, even a single character. If you don't need feedback during the computation, use a single space so it will not occupy real estate in the browser window. 

... code

$| = 1; # set autoflush
print "Content-type: text/html\n\n"; 

# simulate long running computation:
for (1..3600){
    sleep 1;
    # or do some processing

    # sends a single space to browser every 10 seconds
    unless ($_ % 10){ print ' ' }
}

... more code

[download]

Update: Set autoflush before doing this.

In reply to Re: How to avoid browser time out? by hangon
in thread How to avoid browser time out? by advait

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