diff --git a/pykube/http.py b/pykube/http.py
index a755d32..517a2db 100644
--- a/pykube/http.py
+++ b/pykube/http.py
@@ -275,7 +275,12 @@ def get_kwargs(self, **kwargs) -> dict:
             if "base" not in kwargs:
                 raise TypeError("unknown API version; base kwarg must be specified.")
             base = kwargs.pop("base")
-        bits = [base, version]
+        if version.startswith("/"):
+            # for compatibility with pykube-ng 20.1.0 when calling api.get(version="/apis"):
+            # posixpath.join() was throwing away everything before the first "absolute" path (i.e. starting with a slash)
+            bits = [version]
+        else:
+            bits = [base, version]
         # Overwrite (default) namespace from context if it was set
         if "namespace" in kwargs:
             n = kwargs.pop("namespace")
diff --git a/tests/test_http.py b/tests/test_http.py
index 5b803bc..5acb23f 100644
--- a/tests/test_http.py
+++ b/tests/test_http.py
@@ -99,3 +99,21 @@ def test_http_with_oidc_auth(monkeypatch):
 
     mock_send.assert_called_once()
     assert mock_send.call_args[0][0].headers["Authorization"] == "Bearer some-id-token"
+
+
+def test_get_kwargs():
+    cfg = KubeConfig.from_file(GOOD_CONFIG_FILE_PATH)
+    api = HTTPClient(cfg)
+
+    assert api.get_kwargs(version="v1") == {
+        "timeout": 10,
+        "url": "http://localhost/api/v1/",
+    }
+    assert api.get_kwargs(version="/apis") == {
+        "timeout": 10,
+        "url": "http://localhost/apis/",
+    }
+    assert api.get_kwargs(version="storage.k8s.io/v1") == {
+        "timeout": 10,
+        "url": "http://localhost/apis/storage.k8s.io/v1/",
+    }