调用.ashx返回的文件不是JSON结果

I know this is working because I'm getting data populated in a jQuery plug-in once it parses the JSON response. And I've called this so many times before in the past just to check out the returned JSON in the browser. But lately for whatever reason, and after I've stepped through with the debugger to find that the code in my .ashx is working just fine, I get a download prompt returned prompting me to download the .ashx file instead of JSONI know this is working because I'm getting data