xmlhttprequest状态问题302 [英] Problems with xmlhttprequest status 302

问题描述

  function getRealURL（）{
 
 var st = new String（）; 
 var req = new XMLHttpRequest（）; 
 req.open（GET，http://www.megaupload.com/?d=6CKP1MVJ，true）; 
 req.send（null）; 
 req.send（null）; 
 req.onreadystatechange = function（aEvt）{
 if（req.readyState == 4）{
 if（req.status == 302）{
 // SUCESSO 
 st = req.responseText; 
} 
} 
}; // funcao 
 
 element.getElementById（id）。setAttribute（value，st）; 
 
 
 
 
 $ b我需要这个链接：重定向到： http://www534.megaupload.com/files/c2c36829bc392692525f5b7b3d9d81dd/Coldplay   -  Warning Sign.mp3 
 
 
 
登上了这个： http：//www.megaupload。 com /？d = 6CKP1MVJ   
 
解决方案
  XMLHttpRequest 默认情况下自动重定向，所以你看不到302响应。您需要将 nsIHttpChannel.redirectionLimit 属性设置为零以防止它：
  req.open（GET，http://www.megaupload.com/?d=6CKP1MVJ，true）; 
 req.channel.QueryInterface（Components.interfaces.nsIHttpChannel）.redirectionLimit = 0; 
 req.send（null）; 
  
不是您在这里使用的链接会重定向到任何地方，但这是一般的方法。顺便说一句，而不是看重定向的响应文本，你应该看看 req.getResponseHeader（Location）。
 
I am trying to get real path in link megaupload but always but this dont work.
function getRealURL(){

    var st = new String(""); 
    var req = new XMLHttpRequest();
    req.open("GET","http://www.megaupload.com/?d=6CKP1MVJ",true);
    req.send(null);
    req.send(null);
    req.onreadystatechange = function (aEvt) {
     if (req.readyState == 4) {
        if(req.status == 302){
          //SUCESSO
           st = req.responseText;
        }
      }
    };//funcao

    element.getElementById("id").setAttribute("value", st);

}
i need this link: Redirect to: http://www534.megaupload.com/files/c2c36829bc392692525f5b7b3d9d81dd/Coldplay - Warning Sign.mp3

insted of this: http://www.megaupload.com/?d=6CKP1MVJ
解决方案
XMLHttpRequest follows the redirect automatically by default so you don't see the 302 response. You need to set nsIHttpChannel.redirectionLimit property to zero to prevent it:
req.open("GET","http://www.megaupload.com/?d=6CKP1MVJ",true);
req.channel.QueryInterface(Components.interfaces.nsIHttpChannel).redirectionLimit = 0;
req.send(null);
Not that the link you use here redirects anywhere but this is the general approach. Btw, instead of looking at the response text for redirects you should look at req.getResponseHeader("Location").

                        
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