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  1. or download this
    <!DOCTYPE html>
    <html lang="en-US">
    ...
    <div><button id="send">Send</button></div>
    </body>
    </html>
    
  2. or download this
    #!/usr/bin/env perl
    use warnings;
    ...
    
    print header(-charset=>'UTF-8', -type=>'application/json');
    print encode_json($response);