Why is #_=_ appended to the redirect URI? passport facebook code example

Example 1: Why is #_=_ appended to the redirect URI? passport facebook

//If #_=_ was appended to the URL:
if(location.hash == '#_=_'){
  //Store the "clean" URL in a variable
  var cleanURL = location.href.split('#')[0];
  //Set the URL to the "clean" URL
  location.replace(cleanURL);
};

Example 2: Why is #_=_ appended to the redirect URI? passport facebook

// Remove the ugly Facebook appended hash
// <https://github.com/jaredhanson/passport-facebook/issues/12>
if (window.location.hash && window.location.hash === "#_=_") {
  // If you are not using Modernizr, then the alternative is:
  //   `if (window.history && history.pushState) {`
  if (Modernizr.history) {
    window.history.pushState("", document.title, window.location.pathname);
  } else {
    // Prevent scrolling by storing the page's current scroll offset
    var scroll = {
      top: document.body.scrollTop,
      left: document.body.scrollLeft
    };
    window.location.hash = "";
    // Restore the scroll offset, should be flicker free
    document.body.scrollTop = scroll.top;
    document.body.scrollLeft = scroll.left;
  }
}

Example 3: Why is #_=_ appended to the redirect URI? passport facebook

<html xmlns:fb='http://www.facebook.com/2008/fbml'>
<head>
        <script type="text/javascript">
        // Get rid of the Facebook residue hash in the URI
        // Must be done in JS cuz hash only exists client-side
        // IE and Chrome version of the hack
        if (String(window.location.hash).substring(0,1) == "#") {
                window.location.hash = "";
                window.location.href=window.location.href.slice(0, -1);
                }
        // Firefox version of the hack
        if (String(location.hash).substring(0,1) == "#") {
                location.hash = "";
                location.href=location.href.substring(0,location.href.length-3);
                }
        </script>
</head>
<body>
URI should be clean
</body>
</html>

Example 4: Why is #_=_ appended to the redirect URI? passport facebook

$(window).on('load', function(e){
  if (window.location.hash == '#_=_') {
    window.location.hash = ''; // for older browsers, leaves a # behind
    history.pushState('', document.title, window.location.pathname); // nice and clean
    e.preventDefault(); // no page reload
  }
})

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