Ajax Problems in IE

[Galway]

Hey all. This isn't really a question so much as a "watch out for".

I spent half a day's work yesterday trying to figure out some horrible problem that my page was having. Basically, it would read a table of data from my database, and then depending on whether i click add or remove a row, it would do so, and read the new table of data, all using Ajax. This worked fine with firefox and safari, but I was having the weirdest problems with internet explorer. I would click the 'add' button, and it would pull up rows that weren't even in the database anymore as of hours ago. So immediately I knew this was some sort of cache problem and I found this page:

http://devcentral.f5.com/weblogs/mac...6/26/3397.aspx

The important part being this regarding Ajax:

Most of the implementations also realize HTTP caching. Internet Explorer and Firefox do, but there is a difference in how and when the cached data is revalidated. Firefox revalidates the cached response every time the page is refreshed, issuing an "If-Modified-Since" header with value set to the value of the "Last-Modified" header of the cached response.

Internet Explorer does so only if the cached response is expired (i.e., after the date of received "Expires" header).

I used the third work around on that page, change all requests to use POST instead of GET.

I hope this saves someone hours of frustration!

[DanInMA]

another common method is to add a randomly generated number and passing it in the request string url. like index.php?rand=0.2322462

http://stackoverflow.com/questions/3...rowser-caching
http://arsenalist.com/2007/05/02/aja...rnet-explorer/
http://radio.javaranch.com/pascarell...908221072.html
http://stackoverflow.com/questions/3...rowser-caching

[eval(BadCode)]

It only has to work long enough to get another browser I wouldn't even trust it to do that right (better check that MD5).