requests: Support file:// scheme for local files.

This allows installing packages using mip
from an index served from the local fs.

Signed-off-by: Dominik Heidler <dheidler@suse.de>

python-ecosys/requests/requests/__init__.py

@@ -71,6 +71,10 @@ def request(
         import tls
 
         port = 443
+    elif proto == "file:":
+        r = Response(open(url[7:], "b"))
+        r.status_code = 200
+        return r
     else:
         raise ValueError("Unsupported protocol: " + proto)