Routing probe: does a per-code directory index serve at /v/<code>?

Throwaway file to establish whether static per-video pages with baked-in
Open Graph tags can live at the short URL, or whether the host will keep
falling back to the root index.

v/probe123/index.html

@@ -0,0 +1,8 @@
+<!doctype html>
+<html><head>
+<meta charset="utf-8">
+<title>ROUTING PROBE</title>
+<meta property="og:title" content="probe og title">
+<meta property="og:image" content="https://example.com/probe.jpg">
+</head>
+<body><p id="probe">directory-index routing works</p></body></html>