[RESOLVED] Ajax: GET works, POST doesn't...

ixalmida

I'm stumped here. I've got Ajax code working fine with the POST method in other parts of my website, but not working on this page for some reason. Yet when I use GET, it works fine.

For troubleshooting, I'm just dumping the POST and GET arrays:

echo "POST: ";
var_dump($_POST);
echo "\n\nGET:";
var_dump($_GET);
die();

The GET method below alerts me with the correct dump GET array variables. But if I try to use the POST method (commented out below), both arrays come up empty.

    // Process AJAX...
    function postResult(url, vars)
      {
      // Initialize AJAX...
      ajaxObj = getObj();

  // Set up request...
  ajaxObj.open('get', url + '?' + vars, true);
//      ajaxObj.open('post', url, true);

  // Process...
  ajaxObj.onreadystatechange = function doThis()
    {
    if(ajaxObj.readyState == 4 || ajaxObj.readyState == 'complete')
      {
      alert(ajaxObj.responseText);
      }
    }

  // Send request...
  ajaxObj.send(null);
//      ajaxObj.send(vars);
      }

The most puzzling thing is that Firebug indicates that the POST variable is correct:

"Post: wid=1190&txt=xxx12"

Any clues?

Weedpacket

I'd recommend you use 'POST' rather than 'post'.
You'll also need to change the MIME type of the request before you send it:

ajaxObj.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

ixalmida

That header did it. Thanks! I had tried sending some other headers that I found via web search but they caused errors.

I'm wondering if the reason POST wasn't working here without the mime type might have to do with a certificate error. The production server (where the header isn't necessary) has a valid certificate, but the test (backup) server's certificate is invalid until the primary server goes offline. Then DNS fails over and the backup server inherits the correct domain name, which corrects the error. The wild card is how the browser deals with the perceived security issue. Just a guess...

I've seen 'post' written both ways and tried it both ways and it didn't seem to make a difference.