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How does facebook rewrite the source URL of a page in the browser address bar?

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By User


Go to http://www.facebook.com/facebook?v=wall , then click on the info tab. The content will be loaded, and the address bar now becomes http://www.facebook.com/facebook?v=info but the webpage didn't reload.



At first I think it is Ajax, but my question is, how do you change the address bar without reloading? I know I can change anchor (#wall) using JS but querystring (?v=wall), how?


Source: Tips4all, CCNA FINAL EXAM
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  1. UserMay 21, 2012 at 2:26 AM

    It's using HTML5's new history.pushState() feature to allow the page to masquerade as being at a different URL to that from which it was originally fetched.

    This seems only to be supported by WebKit at the moment, which is why the rest of us are seeing ?v=wall#!/facebook?v=info instead of ?v=info.

    The feature allows dynamically-loaded pages to be properly bookmarked, exchanged etc between JS-supporting and non-JS-supporting user agents. Because if you as a JS user linked someone to ?v=wall#!/facebook?v=info and their browser didn't support JS and XMLHttpRequest, the page wouldn't work for them. The #! is also used as a tip to search engines to download the non-AJAX version.

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  2. UserMay 21, 2012 at 2:26 AM

    For MooTools developers I recommend checking out cpojer's mootools-history plugin which provides support for the native history API when available, with a fallback to hashes.

    ReplyDelete
  3. UserMay 21, 2012 at 2:26 AM

    I don't have Facebook so I can't check. But I'm 95% sure that it has to be a full page request, the location bar is unwritable because this would be a very useful feature to absure for phishing websites (instead of http://fakeonlinebank.com it rewrite to http://yourtrustybank). It's probably just so fast that your browser appears to only load that part?

    But I'm curious to see if someone will correct me on this, because that would mean they have the answer you do want to hear ;)

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