xmlhttprequest - exception 101 error

requrl_1 = "http://www.example.com/index.php";
requrl_2 = "http://www.example.com/redirect.php";

when I request "requrl_1", there is no problem. I'm getting response. "index.php" is not a redirector page.

but requrl_2 is a redirector page, that is redirecting to another website(for example: http://www.cnn.com).

so when 开发者_运维知识库I request with XMLHttpRequest, I'm getting exception 101 error.

I must request "redirect.php", there isn't another solution.

How can I do that? Why am I getting "exception 101" error.

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I'm coding a Greasemonkey userscript script for google chrome.

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It's best to just install Tampermonkey and use it to run your script. Then you can code with GM_xmlhttpRequest()^Doc -- which has cross-domain support. And scripts get enhanced capabilities to match what Greasemonkey can do on Firefox.

If you don't want to install Tampermonkey, Chrome userscripts now support cross-site requests via GM_xmlhttpRequest().

So, you could use:

GM_xmlhttpRequest ( {
    method:     "GET",
    url:        "http://www.example.com/redirect.php",
    onload:     function (response) {
                    //-- Do your business here.
                }
} );

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From the XMLHttpRequest Spec

If something goes wrong (infinite loop, network errors) the state must be set to loaded and all members (excluding readyState) of the object must be set to their initial value. Also, if async is set to false, a NETWORK_ERR exception must be raised. In addition, all registered event listeners must be removed.

Basically the redirect is causing the same origin policy to be fired. Which is firing the error. The request should be served with a proxy and not a redirect.