xmlhttprequest在chrome扩展中不起作用

Question

I have to read xml file placed on ftp server. But when i try to open connection and on php run simple mysql query for checking purpose its not working. Can anybody help please. The code in content script is given.

 if (window.XMLHttpRequest)
 {// code for IE7+, Firefox, Chrome, Opera, Safari
 xmlhttp=new XMLHttpRequest();
 }

 else
 {// code for IE6, IE5
 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 xmlhttp.onreadystatechange=function()
 {
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
alert("connection to ftp server is established successfully");
}
}

var str="name";
xmlhttp.open("GET","http://my severurl/foldername/file.php?     
q="+str,true,"username","password");
xmlhttp.send();
alert("worked");    

Answer 1

Have you checked that you added the permission in the manifest.json:

  "permissions": [
    "http://myseverurl/foldername/file.php",
    "tabs",
    "etc..",]