🐛 Fix: 修正 http/websocket client timeout (#3923)

Co-authored-by: Ju4tCode <42488585+yanyongyu@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

nonebot/utils.py

@@ -19,6 +19,7 @@ from collections.abc import (
 import contextlib
 from contextlib import AbstractContextManager, asynccontextmanager
 import dataclasses
+from enum import Enum
 from functools import partial, wraps
 import importlib
 import inspect
@@ -27,8 +28,12 @@ from pathlib import Path
 import re
 from typing import (
     Any,
+    Final,
     Generic,
+    Literal,
+    TypeAlias,
     TypeVar,
+    final,
     get_args,
     get_origin,
     overload,
@@ -49,6 +54,8 @@ from nonebot.typing import (
     type_has_args,
 )
 
+from .compat import custom_validation
+
 P = ParamSpec("P")
 R = TypeVar("R")
 T = TypeVar("T")
@@ -57,6 +64,54 @@ V = TypeVar("V")
 E = TypeVar("E", bound=BaseException)
 
 
+@final
+@custom_validation
+class Unset(Enum):
+    _UNSET = "<UNSET>"
+
+    def __repr__(self) -> str:
+        return "<UNSET>"
+
+    def __str__(self) -> str:
+        return self.__repr__()
+
+    def __bool__(self) -> Literal[False]:
+        return False
+
+    def __copy__(self):
+        return self._UNSET
+
+    def __deepcopy__(self, memo: dict[int, Any]):
+        return self._UNSET
+
+    @classmethod
+    def __get_validators__(cls):
+        yield cls._validate
+
+    @classmethod
+    def _validate(cls, value: Any):
+        if value is not cls._UNSET:
+            raise ValueError(f"{value!r} is not UNSET")
+        return value
+
+
+UnsetType: TypeAlias = Literal[Unset._UNSET]
+
+UNSET: Final[UnsetType] = Unset._UNSET
+
+
+def exclude_unset(data: Any) -> Any:
+    if isinstance(data, dict):
+        return data.__class__(
+            (k, exclude_unset(v)) for k, v in data.items() if v is not UNSET
+        )
+    elif isinstance(data, list):
+        return data.__class__(exclude_unset(i) for i in data if i is not UNSET)
+    elif data is UNSET:
+        return None
+    return data
+
+
 def escape_tag(s: str) -> str:
     """用于记录带颜色日志时转义 `<tag>` 类型特殊标签