diff --git a/tests/test_numpy_type.py b/tests/test_numpy_type.py
index 1f53f6c..822eceb 100644
--- a/tests/test_numpy_type.py
+++ b/tests/test_numpy_type.py
@@ -2,6 +2,7 @@
 
 from pydantic import BaseModel, RootModel
 import numpy as np
+from fastapi.testclient import TestClient
 
 from labthings_fastapi.testing import create_thing_without_server
 from labthings_fastapi.types.numpy import NDArray, DenumpifyingDict
@@ -70,6 +71,10 @@ class MyNumpyThing(lt.Thing):
     def action_with_arrays(self, a: NDArray) -> NDArray:
         return a * 2
 
+    @lt.action
+    def read_array(self) -> NDArray:
+        return np.array([1, 2])
+
 
 def test_thing_description():
     """Make sure the TD validates when numpy types are used."""
@@ -102,3 +107,14 @@ def test_rootmodel():
         m = ArrayModel(root=input)
         assert isinstance(m.root, np.ndarray)
         assert (m.model_dump() == [0, 1, 2]).all()
+
+
+def test_numpy_over_http():
+    """Read numpy array over http."""
+    server = lt.ThingServer({"np_thing": MyNumpyThing})
+    with TestClient(server.app) as client:
+        np_thing_client = lt.ThingClient.from_url("/np_thing/", client=client)
+
+        array = np_thing_client.read_array()
+        assert isinstance(array, np.ndarray)
+        assert np.array_equal(array, np.array([1, 2]))