No AJAX response text

I think the code is right, but I don't get any response in my second alert. When I go to the website given in the first alert, I get the text I want. Why doesn't it work?

<script type="text/javascript">

function getimages(q) {
   bossimagesrequest = new XMLHttpRequest;
   var requri = "http://boss.yahooapis.com/ysearch/images/v1/"+escape(q)+"?appid=yahoobosskey&filter=true&count=10";
   bossimagesrequest.open("GET", requri, true);
   bossimagesrequest.onreadystatechange = function() {
      if (bossimagesrequest.readyState === 4) {
         alert(requri);
         alert(bossimagesrequest.responseText);
      }
   };
   bossimagesrequ开发者_StackOverflow社区est.send();
}
</script>

I did replace "yahoobosskey" with my API key, so that's not the problem.

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It looks like you have bumped into the same origin policy. You may have to use a relative path instead of your absolute http://boss.yahooapis.com/... path.

Related: Empty responseText from XMLHttpRequest

You may also be interested in checking out the following Stack Overflow community wiki post:

• Ways to circumvent the same-origin policy