diff --git a/sanic/app.py b/sanic/app.py
index 47a600cb..78327b46 100644
--- a/sanic/app.py
+++ b/sanic/app.py
@@ -1315,7 +1315,7 @@ class Sanic(BaseSanic, RunnerMixin, metaclass=TouchUpMeta):
         self.config.update_config(config)
 
     @property
-    def asgi(self):
+    def asgi(self) -> bool:
         return self.state.asgi
 
     @asgi.setter
diff --git a/sanic/mixins/runner.py b/sanic/mixins/runner.py
index 57387401..a94cf574 100644
--- a/sanic/mixins/runner.py
+++ b/sanic/mixins/runner.py
@@ -526,7 +526,7 @@ class RunnerMixin(metaclass=SanicMeta):
                     )
                 )
             else:
-                server = "ASGI" if self.asgi else "unknown"
+                server = "ASGI" if self.asgi else "unknown"  # type: ignore
 
             display = {
                 "mode": " ".join(mode),
@@ -576,7 +576,7 @@ class RunnerMixin(metaclass=SanicMeta):
             server_settings = self.state.server_info[0].settings
             return self.get_server_location(server_settings)
         except IndexError:
-            location = "ASGI" if self.asgi else "unknown"
+            location = "ASGI" if self.asgi else "unknown"  # type: ignore
             return f"http://<{location}>"
 
     @staticmethod
diff --git a/tests/test_asgi.py b/tests/test_asgi.py
index 4c473047..129bbe0b 100644
--- a/tests/test_asgi.py
+++ b/tests/test_asgi.py
@@ -546,3 +546,13 @@ async def test_signals_triggered(app):
     assert response.status_code == 200
     assert response.text == "test_signals_triggered"
     assert signals_triggered == signals_expected
+
+
+@pytest.mark.asyncio
+async def test_asgi_serve_location(app):
+    @app.get("/")
+    def _request(request: Request):
+        return text(request.app.serve_location)
+
+    _, response = await app.asgi_client.get("/")
+    assert response.text == "http://<ASGI>"
diff --git a/tests/test_http.py b/tests/test_http.py
index 1e385449..edcbfed8 100644
--- a/tests/test_http.py
+++ b/tests/test_http.py
@@ -2,6 +2,7 @@ import json as stdjson
 
 from collections import namedtuple
 from pathlib import Path
+from sys import version_info
 
 import pytest
 
@@ -74,7 +75,10 @@ def test_full_message(client):
         """
     )
     response = client.recv()
-    assert len(response) == 151
+
+    # AltSvcCheck touchup removes the Alt-Svc header from the
+    # response in the Python 3.9+ in this case
+    assert len(response) == (151 if version_info < (3, 9) else 140)
     assert b"200 OK" in response