Why does XMLHttpRequest return status 0 on iphone but status 200 on web browser

Question

I am building a web-site that calls php on the backend for some pages. When I view the html page on a computer browser, it returns with a status of 200 and shows content returned from php script. However, when I view the same page on my iphone it returns a status of 0 (and subsequently nothing is returned/displayed). Here is a sample of the code - very simple.

Here is what the html page looks like at the script location:

<script>
 function load() {
   var httpr = new XMLHttpRequest();
   httpr.onreadystatechange = function() {
     if (httpr.readyState == 4 ) { // && httpr.status == 200
       alert(httpr.status);
     }
   }

   httpr.open("GET", "https://www.mywebsite/myphpscript.php", true);
   httpr.send();
 }

 load();
</script>

When I go view the page on my iphone, and am tailing the php logfile on my webserver, I do see messages (debug ones I put in the php code), so I know its firing/executing (as of now, the code simply displays some text that I want to parse). If I simply use my iphone to view the php page itself (go directly to the php file v.s. the web-page that includes the php file), it does respond with what I expect to see. It just doesn't work from the html page that invokes the php script via xmlhttprequest.

Any idea why?

Jim Wartnick · Accepted Answer · 2025-04-25 14:48:54Z

0

Ok. I thought this only applied to POST php/cgi, but apparently it has to do with allowing anyone anywhere to have access to the script. I had to add this to the php script:

header('Access-Control-Allow-Origin: *');

answered Apr 25 at 14:48

Jim Wartnick

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