From a900d7d0e26d0dede8fa45ab723e9e64f7879b26 Mon Sep 17 00:00:00 2001
From: Thomas Grainger <tagrain@gmail.com>
Date: Thu, 28 May 2020 11:05:21 +0100
Subject: [PATCH] work around IE XHR bug with '' URL Fixes #618 (#619)

Co-authored-by: Jake Champion <me@jakechampion.name>
---
 fetch.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fetch.js b/fetch.js
index f1ade0dc..08cd0fbb 100644
--- a/fetch.js
+++ b/fetch.js
@@ -486,7 +486,15 @@ export function fetch(input, init) {
       reject(new DOMException('Aborted', 'AbortError'))
     }
 
-    xhr.open(request.method, request.url, true)
+    function fixUrl(url) {
+      try {
+        return url === '' && self.location.href ? self.location.href : url
+      } catch (e) {
+        return url
+      }
+    }
+
+    xhr.open(request.method, fixUrl(request.url), true)
 
     if (request.credentials === 'include') {
       xhr.withCredentials = true