Just open without with to avoid odd crash

    [Tue Feb 06 13:57:09.972838 2024] [wsgi:error] [pid 3001752:tid 140299577837248] [client 71.198.184.218:56874] Traceback (most recent call last):, referer: dandi/dandidav#43
    [Tue Feb 06 13:57:09.973156 2024] [wsgi:error] [pid 3001752:tid 140299577837248] [client 71.198.184.218:56874]   File "/srv/datasets.datalad.org/www/dandi/zarr-manifests/myapp.wsgi", line 35, in <lambda>, referer: dandi/dandidav#43
    [Tue Feb 06 13:57:09.973186 2024] [wsgi:error] [pid 3001752:tid 140299577837248] [client 71.198.184.218:56874]     return iter(lambda: fp.read(65535), b""), referer: dandi/dandidav#43
    [Tue Feb 06 13:57:09.973224 2024] [wsgi:error] [pid 3001752:tid 140299577837248] [client 71.198.184.218:56874]                         ^^^^^^^^^^^^^^, referer: dandi/dandidav#43
    [Tue Feb 06 13:57:09.973295 2024] [wsgi:error] [pid 3001752:tid 140299577837248] [client 71.198.184.218:56874] ValueError: read of closed file, referer: dandi/dandidav#43

myapp.wsgi

@@ -31,8 +31,8 @@ def application(environ, start_response):
                 ("Content-Length", str(os.path.getsize(full_path))),
             ]
             start_response(status, response_headers)
-            with open(full_path, "rb") as fp:
-                return iter(lambda: fp.read(65535), b"")
+            fp = open(full_path, "rb")
+            return iter(lambda: fp.read(65535), b"")
         else:
             # List directory contents
             files = []