When making a xmlhttprequest to call a servlet, I am facing different behaviors in Firefox and IE. In Firefox, everything is working fine, but in IE, the request only triggers sometimes when clicking the refresh button. Additionally, sometimes the response text is displayed without even calling the servlet. Could this be due to caching or some other issue? I don't have any idea what's causing this. Any help would be greatly appreciated.
One issue with MSIE is its overzealous caching of XHR requests. To work around this, it's necessary to include a timestamp querystring in the XHR URL.
var url = '/url/to/your/servlet?' + new Date().getTime();
Appreciate all your help! It turned out that the issue was caused by using "GET" instead of "POST" when calling the servlet in my JavaScript code. Switching to POST resolved the problem successfully.
In order to bypass the excessive caching behavior of Internet Explorer when it comes to XMLHttpRequests, you will need to instruct your servlet to include the following header in the response:
Cache-Control:max-age=0
This directive should be added to the headers of all HTML and .js files that are served. By doing this, all files with this response will be revalidated the next time they are requested from IE, including those fetched via XHR. (It appears that using must-revalidate did not have the same effect on XHR-loaded JavaScript files, though the reason for this is unclear.) Remember to clear the IE cache after implementing this change for it to take effect upon the next page load.
Internet Explorer will behave more appropriately with this configuration. However, it is important to note that this modification should not be used in a production environment.
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