title: Why cannot Apache handle multiple requests at the same time?
body: <p>I have AMPPS installed.</p>
  
  <p>My Apache server cannot handle multiple php requests at once (for example if I call <code>localhost/script.php</code> multiple times, they are processed in a consecutive order). <code>script.php</code> consists only of <code>&lt;?php sleep(10); ?&gt;</code>.</p>
  
  <p>I read that <a href="http://httpd.apache.org/docs/2.0/mod/mpm_common.html#maxclients" rel="noreferrer">MaxClients</a> directive is responsible for concurrent access configuration, but it is missing in my <code>httpd.conf</code> at all.</p>
  
  <p>Disabling Xdebug and writing <code>session_write_close();</code> to the beginning of the script didn't work.</p>
  
  <p>When I added <code>session_start();</code> to the beginning of the file and my code looked like:</p>
  
  <pre><code>&lt;?php
  
  session_start();
  session_write_close();
  sleep(10);
  phpinfo();
  
  echo "Done";
  </code></pre>
  
  <p>When making 5 requests to <code>localhost/script.php</code>, last 4 waited for the first one to end and then ended concurrently.</p>
  
  <p>Please, help me resolve the issue. If any information that is needed to help me resolve this problem is missing, please notify and I will add it.</p>