Restore deprecated status code aliases

Author: Kludex

src/httpx2/httpx2/_status_codes.py

@@ -16,16 +16,15 @@
 
 
 class _CodesMeta(EnumMeta):
-    def __getattr__(cls, name: str) -> codes:
+    def __getattribute__(cls, name: str) -> object:
         if name in _DEPRECATED_CODES:
             new_name = _DEPRECATED_CODES[name]
             warnings.warn(
                 f"'{name}' is deprecated. Use '{new_name}' instead.",
                 category=DeprecationWarning,
                 stacklevel=2,
             )
-            return cls[new_name]
-        raise AttributeError(name)
+        return super().__getattribute__(name)
 
 
 class codes(IntEnum, metaclass=_CodesMeta):
@@ -178,7 +177,13 @@ def is_error(cls, value: int) -> bool:
     NOT_EXTENDED = 510, "Not Extended"
     NETWORK_AUTHENTICATION_REQUIRED = 511, "Network Authentication Required"
 
+    # Deprecated aliases for names replaced by RFC 9110.
+    REQUEST_ENTITY_TOO_LARGE = CONTENT_TOO_LARGE
+    REQUEST_URI_TOO_LONG = URI_TOO_LONG
+    REQUESTED_RANGE_NOT_SATISFIABLE = RANGE_NOT_SATISFIABLE
+    UNPROCESSABLE_ENTITY = UNPROCESSABLE_CONTENT
+
 
 # Include lower-case styles for `requests` compatibility.
-for code in codes:
-    setattr(codes, code._name_.lower(), int(code))
+for name, code in codes.__members__.items():
+    setattr(codes, name.lower(), int(code))

tests/httpx2/test_status_codes.py

@@ -51,6 +51,10 @@ def test_pre_rfc9110_aliases_are_deprecated(old_name: str, new_name: str) -> Non
     with pytest.warns(DeprecationWarning, match=msg):
         assert getattr(httpx2.codes, old_name) == httpx2.codes[new_name]
 
+    assert old_name in httpx2.codes.__members__
+    assert httpx2.codes[old_name] == httpx2.codes[new_name]
+    assert getattr(httpx2.codes, old_name.lower()) == httpx2.codes[new_name]
+
 
 def test_unknown_status_code_attribute_raises() -> None:
     name = "NOT_A_REAL_CODE"