diff --git a/starlette/testclient.py b/starlette/testclient.py
index 04ac90a057..a1ab6ff6d3 100644
--- a/starlette/testclient.py
+++ b/starlette/testclient.py
@@ -245,7 +245,6 @@ def handle_request(self, request: httpx.Request) -> httpx.Response:
                 "scheme": scheme,
                 "query_string": query.encode(),
                 "headers": headers,
-                "client": ["testclient", 50000],
                 "server": [host, port],
                 "subprotocols": subprotocols,
                 "state": self.app_state.copy(),
@@ -263,7 +262,6 @@ def handle_request(self, request: httpx.Request) -> httpx.Response:
             "scheme": scheme,
             "query_string": query.encode(),
             "headers": headers,
-            "client": ["testclient", 50000],
             "server": [host, port],
             "extensions": {"http.response.debug": {}},
             "state": self.app_state.copy(),