requestheaders property for YUI connect for IE bug


I am using YUI connect module for an ajax call in IE 7/8. The problem is the ajax call only goes through once because it's checking the cache first before sending the request out. In prototype, there's a requestheaders property that allows you to modify the if-modified-since property. What this does is change the header information, and I believe the problem is IE is checking if the header has been modified. If not, the ajax call is ignored. But In YUI, I cannot find anything similar to requestheaders property. I need to effectively flush the cache so that the ajax call goes through each and every time but no dice. Can anyone help?

Thank you!

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