multiple urls per entry

Dockers/xtream-proxy/upstreams.json.example

@@ -1,18 +1,16 @@
-#
-# Every entry must point to an Xtream-compatible panel that serves the same
-# content. The proxy probes each entry via /player_api.php and picks the
-# fastest one that is not at its connection limit.
-#
-# The URL may include a path prefix, e.g. https://example.com/portal
-#
 [
   {
-    "url": "http://panel1.example.com:8080",
+    "urls": [
+      "http://panel1.example.com:8080",
+      "https://panel1.example.com"
+    ],
     "username": "user1",
     "password": "pass1"
   },
   {
-    "url": "https://panel2.example.com",
+    "urls": [
+      "https://panel2.example.com"
+    ],
     "username": "user2",
     "password": "pass2"
   }