Comments on: XMLHttpRequest and Caching http://www.subbu.org/blog/2005/10/xmlhttprequest-and-caching HTTP, REST and some Cycling Fri, 12 Mar 2010 22:08:31 +0000 http://wordpress.org/?v=2.8.4 hourly 1 By: subbu http://www.subbu.org/blog/2005/10/xmlhttprequest-and-caching/comment-page-1#comment-51502 subbu Wed, 27 Jan 2010 19:34:14 +0000 http://wp.subbu.org/2005/10/xmlhttprequest-and-caching/#comment-51502 You can use one of the following. req.setRequestHeader("Cache-Control", "no-cache"); req.setRequestHeader("Pragma", "no-cache"); You can use one of the following.

req.setRequestHeader(”Cache-Control”, “no-cache”);
req.setRequestHeader(”Pragma”, “no-cache”);

]]> By: radu http://www.subbu.org/blog/2005/10/xmlhttprequest-and-caching/comment-page-1#comment-51483 radu Wed, 27 Jan 2010 15:53:43 +0000 http://wp.subbu.org/2005/10/xmlhttprequest-and-caching/#comment-51483 xmlhttp.setRequestHeader(’Pragma’, ‘Cache-Control: no-cache’); this didn't work for me. Apparently setRequestHeader is not a method of the xmlhttp object. Instead what I have read in a forum is that even if you do set no-cache and all that stuff on the returned xml from the server, the browsers will still cache if the xmlhttp requests are called in an interval smaller than 2 seconds. And this was actually my problem. Still I would like to make requests farter than that so if you know any working solution, reply here. xmlhttp.setRequestHeader(’Pragma’, ‘Cache-Control: no-cache’);
this didn’t work for me. Apparently setRequestHeader is not a method of the xmlhttp object.
Instead what I have read in a forum is that even if you do set no-cache and all that stuff on the returned xml from the server, the browsers will still cache if the xmlhttp requests are called in an interval smaller than 2 seconds. And this was actually my problem.
Still I would like to make requests farter than that so if you know any working solution, reply here.

]]> By: Carsten S. Rasmussen http://www.subbu.org/blog/2005/10/xmlhttprequest-and-caching/comment-page-1#comment-40472 Carsten S. Rasmussen Fri, 25 Sep 2009 11:47:24 +0000 http://wp.subbu.org/2005/10/xmlhttprequest-and-caching/#comment-40472 This worked for me. xmlhttp.setRequestHeader('Pragma', 'Cache-Control: no-cache'); This worked for me.
xmlhttp.setRequestHeader(’Pragma’, ‘Cache-Control: no-cache’);

]]> By: Marius Gedminas http://www.subbu.org/blog/2005/10/xmlhttprequest-and-caching/comment-page-1#comment-22680 Marius Gedminas Thu, 19 Mar 2009 10:44:05 +0000 http://wp.subbu.org/2005/10/xmlhttprequest-and-caching/#comment-22680 Experiments indicate that Expires: -1 only <em>mostly</em> works (MSIE 6.0.2900.5512.xpsp.080413-2111). If you do the requests quickly enough, you may still see cached data for some of them. Specifically, you get cached data if you issue a new XMLHttpRequest within 2 seconds of the old one. Experiments indicate that Expires: -1 only mostly works (MSIE 6.0.2900.5512.xpsp.080413-2111). If you do the requests quickly enough, you may still see cached data for some of them. Specifically, you get cached data if you issue a new XMLHttpRequest within 2 seconds of the old one.

]]> By: Benjie Chen http://www.subbu.org/blog/2005/10/xmlhttprequest-and-caching/comment-page-1#comment-2044 Benjie Chen Fri, 05 Sep 2008 12:57:56 +0000 http://wp.subbu.org/2005/10/xmlhttprequest-and-caching/#comment-2044 A simple "Expires: -1" from the server would do the trick if you don't want IE6/7 to cache RPC responses. I found "Cache-Control: no-cache" did not work. A simple “Expires: -1″ from the server would do the trick if you don’t want IE6/7 to cache RPC responses. I found “Cache-Control: no-cache” did not work.

]]> By: florian geiges http://www.subbu.org/blog/2005/10/xmlhttprequest-and-caching/comment-page-1#comment-76 florian geiges Wed, 12 Mar 2008 00:37:59 +0000 http://wp.subbu.org/2005/10/xmlhttprequest-and-caching/#comment-76 to get non-cached-results from internet-explorer you might also want to send the If-Modified-Since-header with a value of jan 1, 1970 (or new Date(0), for javascript) does the same as setting cache-control/pragma-headers on the server-side. to get non-cached-results from internet-explorer you might also want to send the If-Modified-Since-header with a value of jan 1, 1970 (or new Date(0), for javascript)

does the same as setting cache-control/pragma-headers on the server-side.

]]> By: Andrew Collins http://www.subbu.org/blog/2005/10/xmlhttprequest-and-caching/comment-page-1#comment-75 Andrew Collins Mon, 24 Oct 2005 21:25:24 +0000 http://wp.subbu.org/2005/10/xmlhttprequest-and-caching/#comment-75 I have posted a handful of bug reports to some AJAX libraries about this issue but they were dismissed. Thank you for researching this matter and providing your results. I hope more AJAX library authors read about this issue and make what fixes they can to them. I have posted a handful of bug reports to some AJAX libraries about this issue but they were dismissed. Thank you for researching this matter and providing your results. I hope more AJAX library authors read about this issue and make what fixes they can to them.

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