Chrome扩展程序的跨域XMLHttpRequest返回状态0

Question

I am writing a Chrome Extension which needs to load some data from another site. From my research I believe I should use XMLHttpRequest for this but it returns responseText="" and status=0 for every site that I try. The URLs that I pass into the javascript are good; I have tried

http://www.google.com

and

http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quotes%20where%20symbol%20in%20(%22MSFT%22)&env=store://datatables.org/alltableswithkeys .

Am I doing something ignorant/stupid? I believe that it is something with the permissions in the manifest, but what I have now should allow both of these sites. I see no errors in my javascript console.

The manifest:

{
  "manifest_version": 2,

  "name": "nnnn",
  "description": "nnnn",
  "version": "1.0",

  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "http://*.query.yahooapis.com/*",
    "http://*/*",
    "https://*/*"    
  ]
}

The javascript function:

function getSite(queryUrl) {
  var request = new XMLHttpRequest();
  request.open("GET", queryUrl, true);
  console.log(queryUrl);
  request.onreadystatechange = function () {
    console.log(request);
   if (request.readyState == 4) {
      if (request.status == 200) {
        console.log(request.responseText);
      } else {
        console.log('Unable to resolve address');
      }
    }
  };
  request.send(null);
}

EDIT: http://developer.chrome.com/extensions/xhr.html This is pretty much what I have been following for guidance but apparently something has gone over my head.

Answer 1

I don't believe it's a permission related problem. If it were, there would be an error message in console announcing permission problem. I think there's something wrong with your XMLHttpRequest. Make sure the queryUrl you pass to the function is correct.

You can use Fiddler to check out what's wrong with your request.

Answer 2

我做了一些无知的事情，并且提交了表单，这导致页面刷新并在完成时丢弃了先前的XMLHttpRequest