Dojo xhr get not setting XmlHttpRequest - php

Question

I'm using Dojo 1.7.2 and I try the following code
var request = xhr.get({
url: location,
content : content,
load : function( data ){
for( var x in data )
{
alert ( x + data[x] );
}
},
error : function()
{
alert( 'Had an eror' );
},
handleAs : 'json'
});
Then in php i do the following to try and detect the xmlhttprequest
function isAjax(){
$ajax = (isset( $_SERVER[ 'HTTP_X_REQUESTED_WITH' ] ) ) &&
( strtolower( $_SERVER[ 'HTTP_X_REQUESTED_WITH' ] ) == 'xmlhttprequest' );
return $ajax;
}
But the isAjax function returns false.
If I do xhr.post then it works fine. I'm thinking this is just a side effect of using GET instead of POST? Is that it or is it something else that I'm not checking for.

Answer 1

This solution is based on Zend Framework version.
function isAjax() {
$header = 'X_REQUESTED_WITH';
// Try to get it from the $_SERVER array first
$temp = 'HTTP_' . strtoupper(str_replace('-', '_', $header));
if (isset($_SERVER[$temp])) {
return $_SERVER[$temp] == 'XMLHttpRequest';
}
// This seems to be the only way to get the Authorization header on
// Apache
if (function_exists('apache_request_headers')) {
$headers = apache_request_headers();
if (isset($headers[$header])) {
return $headers[$header] == 'XMLHttpRequest';
}
$header = strtolower($header);
foreach ($headers as $key => $value) {
if (strtolower($key) == $header) {
return true;
}
}
}
return false;
}

Answer 2

It is not a standard that this header is appended - as it is an unnescesary overhead in most cases.
You need to set the header yourself - and can call it whatever you please really. What you want is headers: { "X-Requested-With": "XMLHttpRequest" }:
var request = xhr.get({
url: location,
content : content,
headers: { "X-Requested-With": "XMLHttpRequest" }, // << < add this
load : function( data ){
for( var x in data )
{
alert ( x + data[x] );
}
},
error : function()
{
alert( 'Had an eror' );
},
handleAs : 'json'
});