Deprecate fully websockets.http.

All public API within this module are deprecated since version 9.0
so there's nothing to document.

src/websockets/connection.py

@@ -2,7 +2,6 @@
 
 import warnings
 
-# lazy_import doesn't support this use case.
 from .protocol import SEND_EOF, Protocol as Connection, Side, State  # noqa: F401
 
 

src/websockets/http.py

@@ -1,26 +1,15 @@
 from __future__ import annotations
 
-import typing
+import warnings
 
-from .imports import lazy_import
+from .datastructures import Headers, MultipleValuesError  # noqa: F401
+from .legacy.http import read_request, read_response  # noqa: F401
 
 
-# For backwards compatibility:
-
-
-# When type checking, import non-deprecated aliases eagerly. Else, import on demand.
-if typing.TYPE_CHECKING:
-    from .datastructures import Headers, MultipleValuesError  # noqa: F401
-else:
-    lazy_import(
-        globals(),
-        # Headers and MultipleValuesError used to be defined in this module.
-        aliases={
-            "Headers": ".datastructures",
-            "MultipleValuesError": ".datastructures",
-        },
-        deprecated_aliases={
-            "read_request": ".legacy.http",
-            "read_response": ".legacy.http",
-        },
-    )
+warnings.warn(
+    "Headers and MultipleValuesError were moved "
+    "from websockets.http to websockets.datastructures"
+    "and read_request and read_response were moved "
+    "from websockets.http to websockets.legacy.http",
+    DeprecationWarning,
+)

tests/test_http.py

@@ -0,0 +1,16 @@
+from websockets.datastructures import Headers
+
+from .utils import DeprecationTestCase
+
+
+class BackwardsCompatibilityTests(DeprecationTestCase):
+    def test_headers_class(self):
+        with self.assertDeprecationWarning(
+            "Headers and MultipleValuesError were moved "
+            "from websockets.http to websockets.datastructures"
+            "and read_request and read_response were moved "
+            "from websockets.http to websockets.legacy.http",
+        ):
+            from websockets.http import Headers as OldHeaders
+
+        self.assertIs(OldHeaders, Headers)