The Loader.path was being added to the File URL even if the URL was absolute. This is now checked for and the path is not applied unless the URL is relative phaserjs#5301

Author: photonstorm

src/loader/File.js

@@ -77,7 +77,18 @@ var File = new Class({
 
         if (!this.type || !this.key)
         {
-            throw new Error('Error calling \'Loader.' + this.type + '\' invalid key provided.');
+            throw new Error('Invalid Loader.' + this.type + ' key');
+        }
+
+        var url = GetFastValue(fileConfig, 'url');
+
+        if (url === undefined)
+        {
+            url = loader.path + loadKey + '.' + GetFastValue(fileConfig, 'extension', '');
+        }
+        else if (typeof url === 'string' && !url.match(/^(?:blob:|data:|http:\/\/|https:\/\/|\/\/)/))
+        {
+            url = loader.path + url;
         }
 
         /**
@@ -91,16 +102,7 @@ var File = new Class({
          * @type {object|string}
          * @since 3.0.0
          */
-        this.url = GetFastValue(fileConfig, 'url');
-
-        if (this.url === undefined)
-        {
-            this.url = loader.path + loadKey + '.' + GetFastValue(fileConfig, 'extension', '');
-        }
-        else if (typeof this.url === 'string' && this.url.indexOf('blob:') !== 0 && this.url.indexOf('data:') !== 0)
-        {
-            this.url = loader.path + this.url;
-        }
+        this.url = url;
 
         /**
          * The final URL this file will load from, including baseURL and path.