From fd5c261bd12c1a5fb6fd6a24e9dd1697d5a82fd8 Mon Sep 17 00:00:00 2001
From: James Smith <jamesplease2@gmail.com>
Date: Thu, 7 Dec 2017 12:11:08 -0800
Subject: [PATCH] Skip creation of XHR if signal is already aborted

---
 fetch.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fetch.js b/fetch.js
index 5b42a839..fc6d1b4b 100644
--- a/fetch.js
+++ b/fetch.js
@@ -425,6 +425,10 @@
       var request = new Request(input, init)
       var xhr = new XMLHttpRequest()
 
+      if (request.signal && request.signal.aborted) {
+        return reject(new DOMException('Aborted', 'AbortError'));
+      }
+
       xhr.onload = function() {
         var options = {
           status: xhr.status,