Removed non-standard (and not that useful) xhr emulation methods & reworked the headers test as a consequence.

test/data/headers.request.php

@@ -0,0 +1,21 @@
+<?php
+
+if (!function_exists('apache_request_headers')) { 
+	function apache_request_headers() { 
+		foreach($_SERVER as $key=>$value) { 
+			if (substr($key,0,5)=="HTTP_") { 
+				$key=str_replace(" ","-",ucwords(strtolower(str_replace("_"," ",substr($key,5))))); 
+				$out[$key]=$value; 
+			}else{ 
+				$out[$key]=$value; 
+			} 
+		} 
+		return $out; 
+	} 
+} 
+
+$headers = apache_request_headers();
+
+foreach( explode( "_" , $_GET[ "keys" ] ) as $key ) {
+	echo "$key: $headers[$key]\n";
+}