Index: src/aphront/AphrontRequest.php
===================================================================
--- src/aphront/AphrontRequest.php
+++ src/aphront/AphrontRequest.php
@@ -471,9 +471,23 @@
     // underscores, then prepending 'HTTP_'.
     $php_index = strtoupper($name);
     $php_index = str_replace('-', '_', $php_index);
-    $php_index = 'HTTP_'.$php_index;
 
-    return idx($_SERVER, $php_index, $default);
+    $try_names = array();
+
+    $try_names[] = 'HTTP_'.$php_index;
+    if ($php_index == 'CONTENT_TYPE' || $php_index == 'CONTENT_LENGTH') {
+      // These headers may be avilable under alternate names. See
+      // http://www.php.net/manual/en/reserved.variables.server.php#110763
+      $try_names[] = $php_index;
+    }
+
+    foreach ($try_names as $try_name) {
+      if (array_key_exists($try_name, $_SERVER)) {
+        return $_SERVER[$try_name];
+      }
+    }
+
+    return $default;
   }
 
 }