javascript xmlhttprequest 状态 302 的问题
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Problems with xmlhttprequest status 302
提问by ericmoraess
I am trying to get real path in link megaupload but always but this dont work.
我试图在链接 megaupload 中获得真实路径，但总是这样，但这不起作用。
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:
我需要这个链接：
Redirect to: http://www534.megaupload.com/files/c2c36829bc392692525f5b7b3d9d81dd/Coldplay - Warning Sign.mp3
insted of this:
这样做的：
http://www.megaupload.com/?d=6CKP1MVJ
回答by Wladimir Palant
XMLHttpRequestfollows the redirect automatically by default so you don't see the 302 response. You need to set nsIHttpChannel.redirectionLimitproperty to zero to prevent it:
XMLHttpRequest默认情况下会自动跟随重定向，因此您看不到 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);
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").
并不是您在此处使用的链接重定向到任何地方，但这是一般方法。顺便说一句，与其查看重定向的响应文本，不如查看req.getResponseHeader("Location").
