diff --git a/lib/OAuth2Client.js b/lib/OAuth2Client.js
index 3738ef9..a926bab 100644
--- a/lib/OAuth2Client.js
+++ b/lib/OAuth2Client.js
@@ -474,9 +474,11 @@ class OAuth2Client extends EventEmitter {
       opts.body = body;
     }
 
-    let url = `${this._apiUrl}${path}${urlAppend}`;
+    let url;
     if (path.startsWith('http://') || path.startsWith('https://')) {
-      url = `${path}${urlAppend}`;
+      url = `${path}${urlAppend}`; // Allow the use of absolute URLs to ignore this._apiUrl
+    } else {
+      url = `${this._apiUrl}${path}${urlAppend}`;
     }
 
     return {