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Is there a way to automate clearing facebook's cache for a url?

Posted on 2016-10-04
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Last Modified: 2016-10-05
We have a page that changes daily but facebook's cache has the old stuff still displaying.  I can go and manually clear it using their tool but this is impractical ... is there a way to automate this process?
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Question by:afacts
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2 Comments
 
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Accepted Solution

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Randy Downs earned 2000 total points
ID: 41829851
Try this .

snippet ... can be included on every page of your site via a common Javascript file. Then, to clear a page’s Facebook cache, simply visit that page and add ?facebook_refresh to the end of the URL (or &facebook_refresh

//Check if facebook_refresh query string is present
if(window.location.search.indexOf("facebook_refresh") >= 0)
{
    //Feature check browsers for support
    if(document.addEventListener && window.XMLHttpRequest && document.querySelector)
    {
        //DOM is ready
        document.addEventListener("DOMContentLoaded", function() {
            var httpRequest = new XMLHttpRequest();
            httpRequest.open("POST", "https://graph.facebook.com", true);
            
            httpRequest.onreadystatechange = function () {
                if (httpRequest.readyState == 4) { console.log("httpRequest.responseText", httpRequest.responseText); }
            };
            
            //Default URL to send to Facebook
            var url = window.location;
            
            //og:url element
            var og_url = document.querySelector("meta[property='og:url']");
            
            //Check if og:url element is present on page
            if(og_url != null)
            {
                //Get the content attribute value of og:url
                var og_url_value = og_url.getAttribute("content");
                
                //If og:url content attribute isn't empty
                if(og_url_value != "")
                {
                    url = og_url_value;
                } else {
                    console.warn('<meta property="og:url" content=""> is empty. Falling back to window.location');
                }               
            } else {
                console.warn('<meta property="og:url" content=""> is missing. Falling back to window.location');
            }
            
            //Send AJAX
            httpRequest.send("scrape=true&id=" + encodeURIComponent(url));
            
        });
    } else {
        console.warn("Your browser doesn't support one of the following: document.addEventListener && window.XMLHttpRequest && document.querySelector");
    }
}

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Author Closing Comment

by:afacts
ID: 41830596
Thank you!!!!!!! This worked!!!!!
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