iPad caching AJAX responses despite setting 'No Store'
I have a page which does an AJAX request to get data, which is then modified by the user. When using the iPad, if the user makes a change, then goes away from the page, then comes back - the AJAX requests are not re-run - meaning the old data is loaded (presumably from the iPad's browser cache).
My server code is ASP.NET Forms, and I have tried setting no cache with all the settings I can find:
Context.Response.Cache.SetNoStore()
Context.Response.Cache.SetETag(New Guid().ToString())
Context.Response.Cache.SetExpires(New DateTime())
Context.Response.Cache.SetNoServerCaching()
Context.Response.Cache.SetCacheability(HttpCacheability.NoCache)
Context.Response.Expires = 0
But no luck. Any ideas?
As proposed in the previous answer, jQuery provides a simple option cache for it's $.ajax method:
If set to false, it will force requested pages not to be cached by the browser. Setting cache to false also appends a query string parameter, "_=[TIMESTAMP]", to the URL.
So for example:
$.ajax({
url: "test.html",
cache: false,
success: function () {
$(this).addClass("done");
}
});
If you are not using jQuery you can implement a similar behavior on your own.
My current fix is to constantly (slightly) modify the URL of the AJAX request:
url: "/AjaxService.asmx/" + methodName + "?dt=" + new Date().getTime()
Because the querystring is passed to the same web method each time, I can ignore it's value, but Safari can't cache the result, because it's always at a different address.
Surely this isn't the best solution, though!
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