From c0ef2d760a4b2ec9e70e608e666cbae8c713663a Mon Sep 17 00:00:00 2001
From: Josh Zana <joshzana@gmail.com>
Date: Thu, 16 Apr 2015 17:20:27 -0700
Subject: [PATCH] Implement XmlHttpRequestBase#getAllResponseHeaders and
 getResponseHeader

Used https://github.com/facebook/react-native/pull/382 as inspiration
but modified to return null instead of undefined as per the spec at
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest

This unblocks use of Dropbox.js within a react-native app, as well
as any other libraries that make use of these methods in XHR usage
---
 Libraries/Network/XMLHttpRequestBase.js | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/Libraries/Network/XMLHttpRequestBase.js b/Libraries/Network/XMLHttpRequestBase.js
index d7619d07546f07..0604bce0f60ccd 100644
--- a/Libraries/Network/XMLHttpRequestBase.js
+++ b/Libraries/Network/XMLHttpRequestBase.js
@@ -53,13 +53,22 @@ class XMLHttpRequestBase {
   }
 
   getAllResponseHeaders(): ?string {
-    /* Stub */
-    return '';
+    if (this.responseHeaders) {
+      var headers = [];
+      for (var headerName in this.responseHeaders) {
+        headers.push(headerName + ': ' + this.responseHeaders[headerName]);
+      }
+      return headers.join('\n');
+    }
+    return null;
   }
 
   getResponseHeader(header: string): ?string {
-    /* Stub */
-    return '';
+    if (this.responseHeaders) {
+      var value = this.responseHeaders[header];
+      return value != undefined ? value : null;
+    }
+    return null;
   }
 
   setRequestHeader(header: string, value: any): void {