Robustify simple absolute URL check slightly

optimade/validator/validator.py

@@ -99,7 +99,9 @@ def __init__(self, base_url: str, max_retries=5):
         self.max_retries = max_retries
 
     def get(self, request: str):
-        """ Makes the given request, with a number of retries if being rate limited.
+        """ Makes the given request, with a number of retries if being rate limited. The
+        request will be prepended with the `base_url` unless the request appears to be an
+        absolute URL (i.e. starts with `http://` or `https://`).
 
         Parameters:
             request (str): the request to make against the base URL of this client.
@@ -114,7 +116,7 @@ def get(self, request: str):
 
         """
         if request:
-            if any(request.startswith(scheme) for scheme in ("http", "https")):
+            if any(request.startswith(scheme) for scheme in ("http://", "https://")):
                 self.last_request = request
             else:
                 self.last_request = f"{self.base_url}/{request}".replace("\n", "")