title: PHP loaded twice from Chrome when passing a specific value via URL
body: <p>I'm having a weird issue with a simple php script which execute a python program passing it one parameter. 
  Here below is the <em>script.php</em>:</p>
  
  <pre><code>&lt;?php
  $t = $_GET['t'];
  system("python /var/www/html/ledcontrol.py " . $t);
  ?&gt; 
  </code></pre>
  
  <p>When loading this script from Chrome Mobile with t=5 (<em>/file.php?t=5</em>) the python program is always executed two times in a row: in the Apache access log I find two accesses with different IPs. Instead, if I set <em>t</em> to a different value, or use different browsers, the script runs perfectly.
  How can the value of t=5 affect the behavior of this simple script?
  How can I fix it?</p>
  
  <p>Thank you very much!</p>