From 57a62ad7bc1032beccbf69efb45485dfa97dfe92 Mon Sep 17 00:00:00 2001
From: Roman Alifanov <animaonline@gmail.com>
Date: Thu, 22 Mar 2018 13:29:36 +0100
Subject: [PATCH] Fixed [0.54 - iOS] fetch HEAD requests fail with `Invalid
 response for blob`

---
 Libraries/Network/XMLHttpRequest.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Libraries/Network/XMLHttpRequest.js b/Libraries/Network/XMLHttpRequest.js
index d17001d3743f34..527de858cf9814 100644
--- a/Libraries/Network/XMLHttpRequest.js
+++ b/Libraries/Network/XMLHttpRequest.js
@@ -254,7 +254,11 @@ class XMLHttpRequest extends EventTarget(...XHR_EVENTS) {
         if (typeof this._response === 'object' && this._response) {
           this._cachedResponse = BlobManager.createFromOptions(this._response);
         } else {
-          throw new Error(`Invalid response for blob: ${this._response}`);
+          if (this._response === '')  {
+            this._cachedResponse = null;
+          } else {
+            throw new Error(`Invalid response for blob: ${this._response}`);
+          }
         }
         break;