From 3a04845fa3eb1a61fc5e8f746c9fd1c83502c29e Mon Sep 17 00:00:00 2001
From: Cam Song <neosoyn@gmail.com>
Date: Wed, 9 Dec 2015 21:02:15 +0800
Subject: [PATCH] fix resolve twice bug

---
 fetch.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fetch.js b/fetch.js
index cb4604de..79f89409 100644
--- a/fetch.js
+++ b/fetch.js
@@ -342,12 +342,15 @@
         return;
       }
 
+      var __onLoadHandled = false;
+
       function onload() {
         if (xhr.readyState !== 4) {
           return
         }
         var status = (xhr.status === 1223) ? 204 : xhr.status
         if (status < 100 || status > 599) {
+          if (__onLoadHandled) { return; } else { __onLoadHandled = true; }
           reject(new TypeError('Network request failed'))
           return
         }
@@ -358,11 +361,14 @@
           url: responseURL()
         }
         var body = 'response' in xhr ? xhr.response : xhr.responseText;
+
+        if (__onLoadHandled) { return; } else { __onLoadHandled = true; }
         resolve(new Response(body, options))
       }
       xhr.onreadystatechange = onload;
-      xhr.onload = onload; // FIX: may fire two times
+      xhr.onload = onload;
       xhr.onerror = function() {
+        if (__onLoadHandled) { return; } else { __onLoadHandled = true; }
         reject(new TypeError('Network request failed'))
       }