相关疑难解决方法(0)

在使用XMLHttpRequest进行AJAX调用时,似乎无法从JavaScript更改大多数请求标头.请注意,request.setRequestHeader必须request.open()在Gecko浏览器中调用后(请参阅http://ajaxpatterns.org/Talk:XMLHttpRequest_Call).当我设置Referer时,它没有设置(我查看了使用Firebug和Tamper Data发送的请求标头).当我设置User-Agent时,它完全搞砸了AJAX调用.但是,设置Accept和Content-Type确实有效.我们是否阻止在Firefox 3中设置Referer和User-Agent？

var request = new XMLHttpRequest();
var path="http://www.yahoo.com";
request.onreadystatechange=state_change;

request.open("GET", path, true);
request.setRequestHeader("Referer", "http://www.google.com");
//request.setRequestHeader("User-Agent", "Mozilla/5.0");
request.setRequestHeader("Accept","text/plain");
request.setRequestHeader("Content-Type","text/plain");

request.send(null);
    function state_change()
{
if (request.readyState==4)
  {// 4 = "loaded"
  if (request.status==200)
    {// 200 = OK
    // ...our code here...
    alert('ok');
    }
  else
    {
    alert("Problem retrieving XML data");
    }
  }
}