MooTools Depender, Safari, etags and 412 Precondition Failed

Posted on by 
/**
* This replaces the default MooTools more Depender.request function to use
* HTTP "get" rather than "post".
*
* When sending requests for files via the depender, I was finding that Safari
* wasn't getting and re-evaluating them the second time I visited the page.
* This was because an etag was sent with each script.
*
* Safari responds to etags properly and adds "If-None-Match" and
* "If-Modified-Since" headers to another request for the same file. This makes
* Apache respond with a 412 status (Precondition Failed) as it should do for
* "post" requests (according to RFC 2616).
*
* Unfortunately Safari doesn't then deal with the 412 as it does with a 304
* (Not Modified). It doesn't grab what it has in the cache and put it in the
* response, it gives you nothing.
*
* For "get" requests, Apache has to respond with a 304, or 200 or whatever, but
* not 412. So we change the request method so we don't have to deal with 412.
*/
Depender.request = function(url, callback){
    new Request.JSON({
        url: url,
        secure: false,
        onSuccess: callback,
        method:'get'
    }).send();
};

24,935 thoughts on “MooTools Depender, Safari, etags and 412 Precondition Failed”

  3. Superb blog you have here but I was curious if you knew of any community forums that cover the same topics discussed in this article?
    I’d really love to be a part of community where I can get feed-back from other experienced people that share the same interest.
    If you have any suggestions, please let me know. Many thanks!

  4. I am not sure where you are getting your information, but great topic.
    I needs to spend some time learning more or understanding
    more. Thanks for excellent information I was looking for this info
    for my mission.

  15. Kerner Law Group, P.C. is my top recommendation for anyone needing a Bronx car accident attorney! Their dedication is unmatched.
    I had a fantastic experience with Kerner Law Group, P.C. Their team includes the best Bronx car accident lawyer I’ve ever met Bronx vehicle injury lawyer

  16. Thank you for sharing your thoughts. I really appreciate your efforts and I will
    be waiting for your further post thanks once again.