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Ajax post- Cross domain request XDR

Posted on 2014-01-10
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Last Modified: 2014-02-04
This is my JavaScript code to make XDR post request:

if(isIE()) {
    xdr = new XDomainRequest();
    if (xdr) {
        xdr.onerror = err;
        xdr.ontimeout = timeo;
        xdr.onload = loadd;
        xdr.timeout = 10000;
        xdr.open('POST', url);
        xdr.send('myval=abc'); 
    } 
}

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And when I try to access the variable myval in PHP:

if(isset($HTTP_RAW_POST_DATA)) {
  parse_str($HTTP_RAW_POST_DATA); // here you will get variable $myval
  if($myval== 'abc') {
  echo "TRUE !";
  }
}
else {
 echo 'NO POST DATA';
}

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I get the output as 'NO POST DATA'. Could anyone help me in finding what is wrong here? Many thanks.
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Question by:drl1
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2 Comments
 
LVL 35

Accepted Solution

by:
gr8gonzo earned 2000 total points
ID: 39771337
1. Make sure you're following all the rules here:
http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx

2. $HTTP_RAW_POST_DATA is not enabled / available by default. You need to have always_populate_raw_post_data enabled in your php.ini file:
http://www.php.net/manual/en/ini.core.php#ini.always-populate-raw-post-data
(and most setups need to restart PHP/Apache for php.ini changes to take effect)

Alternatively, you can use the php://input stream, which will give you the same data without incurring the performance cost of forcing PHP to always make that raw data available, even if you don't need to use it on other pages.

Courtesy of Ray Paseur's comment on php.net:
<?php $postdata = file_get_contents("php://input"); ?>

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That said, the $_POST array is probably what you're looking for, not the raw POST data. For example:

if(isset($_POST["myval"]))
{
  echo $_POST["myval"]; // Should display abc
}

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Now, if the intention is to post with the multipart/form-data encoding (usually when you need to also upload files), then the raw data won't even be available. You'll NEED to look at the $_POST array to get that data.
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LVL 35

Expert Comment

by:gr8gonzo
ID: 39771362
By the way, there's a PHP-specific forum area here that would better answer these types of questions in the future.
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