title: What does a dot mean in a URL path?
body: <p>In a <a href="https://stackoverflow.com/questions/5879663/jquery-not-calling-the-php/5884603#5884603">question regarding a jQuery Ajax problem</a>, the asker was trying to use a <code>.</code> in the beginning of a relative URL. I advised him to remove it, but have no idea what a dot actually does there. </p>
  
  <p>His relative URL looked like this:</p>
  
  <p><code>./delete-misc/test-ajax-code.php</code></p>
  
  <p>I tried looking in the RFCs, without success. I know what the dot does in command line (either Linux or Win), it represents the current directory. </p>
  
  <p>I'd like to know: how does this work on the Internet in a URL? Does it have any best-practice uses? Detailed explanations are most welcome.</p>