Guard against xhr.getAllResponseHeaders() being null

From https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest#getAllResponseHeaders(): > Returns all the response headers, separated by CRLF, as a string, or null if no response has been received. I discovered this on Android, once when `xhr.getAllResponseHeaders()` evaluated to `null`.
JakeChampion · May 5, 2016 · 8deb829 · 8deb829
1 parent 3fc66ed
commit 8deb829
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/fetch.js b/fetch.js
@@ -267,7 +267,7 @@
 
   function headers(xhr) {
     var head = new Headers()
-    var pairs = xhr.getAllResponseHeaders().trim().split('\n')
+    var pairs = (xhr.getAllResponseHeaders() || '').trim().split('\n')
     pairs.forEach(function(header) {
       var split = header.trim().split(':')
       var key = split.shift().trim()