如何从jQuery的ajax请求中删除X-Requested-With

$.ajax({ 
url: 'http://www.zhangruifeng.com', 
beforeSend: function( xhr ) { 
xhr.setRequestHeader('X-Requested-With', {toString: function(){ return ''; }}); 
}, 
success: function( data ) { 
if (console && console.log){ 
console.log( 'Got data without the X-Requested-With header' ); 
} 
} 
}); 
 
附,判断ajax请求的方式 java代码 
 代码如下:

if (request.getHeader("x-requested-with") != null 
&& request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) { 
//异步请求 
}else{ 

}