From 6f13a7591ba7c4e2cdfa7ea282c7488df24144ec Mon Sep 17 00:00:00 2001
From: Matt Zabriskie <mzabriskie@gmail.com>
Date: Mon, 18 Jan 2016 11:04:10 -0700
Subject: [PATCH] Only strip Content-Type header if data is undefined

---
 lib/adapters/xhr.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/adapters/xhr.js b/lib/adapters/xhr.js
index 740dc2e..cfb3348 100644
--- a/lib/adapters/xhr.js
+++ b/lib/adapters/xhr.js
@@ -82,7 +82,7 @@ module.exports = function xhrAdapter(resolve, reject, config) {
   // Add headers to the request
   if ('setRequestHeader' in request) {
     utils.forEach(requestHeaders, function setRequestHeader(val, key) {
-      if ((requestData === undefined || requestData === null) && key.toLowerCase() === 'content-type') {
+      if (typeof requestData === 'undefined' && key.toLowerCase() === 'content-type') {
         // Remove Content-Type if data is undefined
         delete requestHeaders[key];
       } else {