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<html lang="en">
  <head>
    <title>Service Unavailable</title>
    <meta charset="utf-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <style type="text/css">
    body {
        background:url(images/service_unavailable_footer.png) fixed no-repeat bottom right;
    }
    </style>
    <script type="text/javascript">
      
      // Referrer parser
      function parseURL(url) {
        var a=document.createElement('a');
        a.href=url;
        return a.hostname;
      }
      
      // Get query string args
      function getArg(key) {
        var querystring = window.location.search.substring(1);
        var elements = querystring.split('&');
        for (var i = 0; i < elements.length; i++) {
          var kp = elements[i].split('=');
          if (decodeURIComponent(kp[0]) == key) {
              return decodeURIComponent(kp[1]);
          }
        }
        return '';
      }
      
      // Display error message
      function displayError() {
        
        // Get domain name
        var site = getArg('site');
        // Default to referrer or current domain name if not specified
        if (site.length == 0) {
          site = parseURL(document.referrer);
          if (!site || site.length == 0) {
            site = window.location.hostname;
          }
          if (site.length == 0) {
            site = "www.apache.org";
          }
        }
        
        // Get error code
        var code = parseInt(getArg('code'));
        var notice = document.getElementById('notice');
        var t = document.getElementById('title');
        
        // Generic message
        var txt = "The site you requested, <a href='http://" + site + "' style='color: #369;'>" + site + "</a>, is currently ";
        var title = "Unknown error";
        // Specific messages
		if (code == 404) {
		  txt += "unavailable. We apologize!<br/>";
		  title = "404 - Page not Found";
		}
		if (code >= 500) {
          if (code == 500) {
            txt += "unavailable due to an error on the backend server. We apologize!<br/>";
            title = "500 - Internal Server Error";
          }
          if (code == 502) {
            txt += "unavailable due to an invalid or missing response from the backend server. We apologize!<br/>";
            title = "502 - Invalid or missing response from backend";
          }
          if (code == 503) {
            txt += "unavailable due to ongoing maintenance.<br/>";
            title = "503 - Service down for maintenance";
          }
          if (code == 504) {
            txt += "unavailable due to a timeout between this server and a backend server. We apologize!<br/>";
            title = "504 - Gateway timeout";
          }
          if (code != 503) {
            txt += "The Apache Infrastructure Team has been notified about the situation.";
          }
        }
        
        // Unknown reason or no code given? Just blurb out something.
        if (code + 0 != code) {
          txt += "unavailable. The Apache Infrastructure Team has been notified about the situation."
        }
        txt += ""
        
        // Set message
        notice.innerHTML = txt;
        t.innerHTML = title;
      }
    </script>
  </head>
  <body onload="displayError();" style="background-color: #FFF; font-family: Calibri,Helvetica,Arial,sans-serif; font-size: 16px; text-align: center;">
    <p>
    <img src="images/service_unavailable.png" title="Sad feather is sad...maybe you should feed it some cookies? Omnomnomnom!" />
    </p>
	  <h3 id="title">Proxy Error</h3>
    <p id="notice">
      The service you requested is currently not available. Please check again later. We apologize for the inconvenience!
    </p>
    <p id="seealso">
      For more information, visit our <a href="http://status.apache.org">general status page</a> or check our <a href="https://www.twitter.com/infrabot">infrastructure twitter feed</a> (see below).<br/>
      You can make further inquiries by emailing `users@infra.apache.org` or, for escalation, by following our <a href="https://infra.apache.org/infra-contact" target="_blank">contact guidelines</a>.<br/><br/>
		<i>For urgent matters, you will often find us on <a href="https://the-asf.slack.com">Slack</a> in the #asfinfra channel.</i><br/> &nbsp;
    </p>
    <p>
      With regards,<br/>
      <a href="/dev/infrastructure.html">The Apache Infrastructure Team</a>.
    </p>
	  <a class="twitter-timeline"  href="https://twitter.com/infrabot"  data-widget-id="340369825161412608">Tweets by @infrabot</a>
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