From 185b683c0f24d28c30fddd764724c8d828bda10c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Felix=20Bu=CC=88nemann?= <buenemann@louis.info>
Date: Fri, 8 Aug 2014 14:50:47 +0200
Subject: [PATCH] Add X-Requested-With: IFrame to iframe transport

This is ported from the jquery-fileupload-rails gem, which uses the
header to detect iframe transport uploads in server middleware.
---
 js/jquery.iframe-transport.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/js/jquery.iframe-transport.js b/js/jquery.iframe-transport.js
index 8d64b591b..2874e6cc5 100644
--- a/js/jquery.iframe-transport.js
+++ b/js/jquery.iframe-transport.js
@@ -119,6 +119,13 @@
                                     .val(field.value)
                                     .appendTo(form);
                             });
+                            // Add a hidden `X-Requested-With` field with the value `IFrame` to the
+                            // form, to help server-side code to determine that the upload happened
+                            // through this transport.
+                            $('<input type="hidden"/>')
+                                .prop('name', 'X-Requested-With')
+                                .val('IFrame')
+                                .appendTo(form);
                         }
                         if (options.fileInput && options.fileInput.length &&
                                 options.type === 'POST') {