Facebook Callback appends '#

Facebook callback has started appending #_=_ hash underscore to the Return URL

Does anyone know why? What is the solution?

---

via Facebook's Platform Updates:

Change in Session Redirect Behavior

This week, we started adding a fragment #____=____ to the redirect_uri when this field is left blank. Please ensure that your app can handle this behavior.

To prevent this, set the redirect_uri in your login url request like so: (using Facebook php-sdk)

$facebook->getLoginUrl(array('redirect_uri' => $_SERVER['SCRIPT_URI'],'scope' => 'user_about_me'));

UPDATE

The above is exactly as the documentation says to fix this. However, Facebook's documented solution does not work. Please consider leaving a comment on the Facebook Platform Updates blog post and follow this bug to get a better answer. Until then, add the following to your head tag to resolve this issue:

<script type="text/javascript">
    if (window.location.hash && window.location.hash == '#_=_') {
        window.location.hash = '';
    }
</script>

Or a more detailed alternative (thanks niftylettuce):

<script type="text/javascript">
    if (window.location.hash && window.location.hash == '#_=_') {
        if (window.history && history.pushState) {
            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;
        }
    }
</script>

---

TL;DR

if (window.location.hash == '#_=_'){
    history.replaceState 
        ? history.replaceState(null, null, window.location.href.split('#')[0])
        : window.location.hash = '';
}

Full version with step by step instructions

// Test for the ugliness.
if (window.location.hash == '#_=_'){

    // Check if the browser supports history.replaceState.
    if (history.replaceState) {

        // Keep the exact URL up to the hash.
        var cleanHref = window.location.href.split('#')[0];

        // Replace the URL in the address bar without messing with the back button.
        history.replaceState(null, null, cleanHref);

    } else {

        // Well, you're on an old browser, we can get rid of the _=_ but not the #.
        window.location.hash = '';

    }

}

Step by step:

We'll only get into the code block if the fragment is #_=_ .

Check if the browser supports the HTML5 window.replaceState method.

Clean the URL by splitting on # and taking only the first part.

Tell history to replace the current page state with the clean URL. This modifies the current history entry instead of creating a new one. What this means is the back and forward buttons will work just the way you want. ;-)

If the browser does not support the awesome HTML 5 history methods then just clean up the URL as best you can by setting the hash to empty string. This is a poor fallback because it still leaves a trailing hash (example.com/#) and also it adds a history entry, so the back button will take you back to #_-_ .

Learn more about history.replaceState .

Learn more about window.location .

---

如果你想从网址中删除剩余的“＃”

$(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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