Issue #3261858 by DamienMcKenna, heddn: The path of a URI with an aut…

…hority must start with a slash "/" or be empty. Automagically fixing the URI. (#164)

Co-authored-by: Lucas Hedding <[email protected]>

src/Services/PantheonGuzzle.php

@@ -166,7 +166,7 @@ public function requestUriAlterForPantheonEnvironment(RequestInterface $request)
     $path_parts = array_filter($path_parts, function ($item) {
         return !empty($item);
     });
-    $uri = $uri->withPath(implode('/', $path_parts));
+    $uri = $uri->withPath('/' . ltrim(implode('/', $path_parts), '/'));
     return $request->withUri($uri);
   }