public  static String getReferer(Vector<String> headers){
	String referer="";
	if(headers.size()<=0){
		return "";
	}
	for(int i=0;i<headers.size();i++){

		if(headers.get(i).toLowerCase().indexOf("refere")!=-1){
			referer=headers.get(i).split(":",2)[1];//ȡreferer Ϊ"http:":2
		}
	}
	return referer;
	
}