fix: service_alive returns False for non-HTTP responders

tests/unit/test_hosts.py

@@ -65,6 +65,7 @@ def status_server():
     thread.start()
     yield f"http://127.0.0.1:{server.server_address[1]}"
     server.shutdown()
+    server.server_close()
 
 
 class TestServiceAlive:
@@ -91,3 +92,30 @@ class TestExternalServer:
     def test_raises_when_dead(self):
         with pytest.raises(ConnectionError, match="no WebDriver server"):
             ExternalServer("http://127.0.0.1:1").ensure_running()
+
+
+class TestServiceAliveNonHttpResponder:
+    def test_non_http_service_on_port_is_false_and_clean_error(self):
+        # wrong-port misconfiguration: some non-HTTP service answers the socket
+        import socket
+
+        server = socket.create_server(("127.0.0.1", 0))
+        port = server.getsockname()[1]
+
+        def answer(count=2):
+            for _ in range(count):
+                try:
+                    conn, _ = server.accept()
+                except OSError:
+                    return
+                conn.sendall(b"SSH-2.0-OpenSSH_9.7\r\n")
+                conn.close()
+
+        thread = threading.Thread(target=answer, daemon=True)
+        thread.start()
+        try:
+            assert service_alive(f"http://127.0.0.1:{port}", timeout=2.0) is False
+            with pytest.raises(ConnectionError, match="no WebDriver server"):
+                ExternalServer(f"http://127.0.0.1:{port}").ensure_running()
+        finally:
+            server.close()