From 1e252e0b45b41b2c3d216c1d2542d592380bf495 Mon Sep 17 00:00:00 2001
From: Behind The Math <aryehb412@gmail.com>
Date: Sat, 6 Jan 2018 21:22:29 -0500
Subject: [PATCH] Add User-Agent header to CORS preflight requests

Fixes #1659.

This mirrors the behavior of other browsers, and fixes broken XHR
requests to APIs that require a User-Agent header for all requests,
such as api.github.com.
---
 lib/jsdom/living/xhr-utils.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/jsdom/living/xhr-utils.js b/lib/jsdom/living/xhr-utils.js
index fc5e43c1a6..2e721d57f6 100644
--- a/lib/jsdom/living/xhr-utils.js
+++ b/lib/jsdom/living/xhr-utils.js
@@ -349,6 +349,8 @@ function createClient(xhr) {
       preflightRequestHeaders["Access-Control-Request-Headers"] = nonSimpleHeaders.join(", ");
     }
 
+    preflightRequestHeaders["User-Agent"] = requestHeaders["User-Agent"];
+
     flag.preflight = true;
 
     const preflightOptions = {