diff --git a/pyproject.toml b/pyproject.toml
index 4f917c9..7326b5c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ dependencies = [
     "httpx",
     "pydantic",
     "requests",
+    "types-requests",
     "tenacity"
 ]
 
@@ -51,6 +52,7 @@ httpx = [
 ]
 requests = [
   "requests",
+  "types-requests",
   "tenacity",
 ]
 dev = [
@@ -59,6 +61,7 @@ dev = [
   "respx",
   "ruff",
   "nox",
+  "types-requests",
 ]
 docs = [
   "mkdocs",
diff --git a/retryhttp/_retry.py b/retryhttp/_retry.py
index 0f44ba0..bfbc99c 100644
--- a/retryhttp/_retry.py
+++ b/retryhttp/_retry.py
@@ -1,4 +1,4 @@
-from typing import Any, Optional, Sequence, Tuple, Type, Union
+from typing import Any, Callable, Optional, Sequence, Tuple, Type, Union, overload
 
 from tenacity import (
     RetryCallState,
@@ -24,6 +24,32 @@
 from ._wait import wait_context_aware, wait_retry_after
 
 
+@overload
+def retry(func: F) -> F: ...
+
+
+@overload
+def retry(
+    func: None = None,
+    *,
+    max_attempt_number: int = 3,
+    retry_server_errors: bool = True,
+    retry_network_errors: bool = True,
+    retry_timeouts: bool = True,
+    retry_rate_limited: bool = True,
+    wait_server_errors: wait_base = wait_random_exponential(),
+    wait_network_errors: wait_base = wait_exponential(),
+    wait_timeouts: wait_base = wait_random_exponential(),
+    wait_rate_limited: wait_base = wait_retry_after(),
+    server_error_codes: Union[Sequence[int], int] = (500, 502, 503, 504),
+    network_errors: Union[
+        Type[BaseException], Tuple[Type[BaseException], ...], None
+    ] = None,
+    timeouts: Union[Type[BaseException], Tuple[Type[BaseException], ...], None] = None,
+    **kwargs: Any,
+) -> Callable[[F], F]: ...
+
+
 def retry(
     func: Optional[F] = None,
     *,
@@ -42,7 +68,7 @@ def retry(
     ] = None,
     timeouts: Union[Type[BaseException], Tuple[Type[BaseException], ...], None] = None,
     **kwargs: Any,
-) -> F:
+) -> Union[F, Callable[[F], F]]:
     """Retry potentially transient HTTP errors with sensible default behavior.
 
     By default, retries the following errors, for a total of 3 attempts, with
@@ -105,7 +131,7 @@ def retry(
     if timeouts is None:
         timeouts = get_default_timeouts()
 
-    retry_strategies = []
+    retry_strategies: list[retry_base] = []
     if retry_server_errors:
         retry_strategies.append(
             retry_if_server_error(server_error_codes=server_error_codes)
diff --git a/retryhttp/_utils.py b/retryhttp/_utils.py
index b33f11c..4cf35c1 100644
--- a/retryhttp/_utils.py
+++ b/retryhttp/_utils.py
@@ -22,9 +22,7 @@
     pass
 
 
-def get_default_network_errors() -> Tuple[
-    Union[Type[httpx.NetworkError], Type[requests.ConnectionError]], ...
-]:
+def get_default_network_errors() -> Tuple[Type[BaseException], ...]:
     """Get all network errors to use by default.
 
     Args:
@@ -37,7 +35,7 @@ def get_default_network_errors() -> Tuple[
         N/A
 
     """
-    exceptions = []
+    exceptions: list[type[BaseException]] = []
     if _HTTPX_INSTALLED:
         exceptions.extend(
             [
@@ -56,16 +54,14 @@ def get_default_network_errors() -> Tuple[
     return tuple(exceptions)
 
 
-def get_default_timeouts() -> Tuple[
-    Type[Union[httpx.TimeoutException, requests.Timeout]], ...
-]:
+def get_default_timeouts() -> Tuple[Type[BaseException], ...]:
     """Get all timeout exceptions to use by default.
 
     Returns:
         tuple: Timeout exceptions.
 
     """
-    exceptions = []
+    exceptions: list[Type[BaseException]] = []
     if _HTTPX_INSTALLED:
         exceptions.append(httpx.TimeoutException)
     if _REQUESTS_INSTALLED:
@@ -73,16 +69,14 @@ def get_default_timeouts() -> Tuple[
     return tuple(exceptions)
 
 
-def get_default_http_status_exceptions() -> Tuple[
-    Union[Type[httpx.HTTPStatusError], Type[requests.HTTPError]], ...
-]:
+def get_default_http_status_exceptions() -> Tuple[Type[BaseException], ...]:
     """Get default HTTP status 4xx or 5xx exceptions.
 
     Returns:
         tuple: HTTP status exceptions.
 
     """
-    exceptions = []
+    exceptions: list[Type[BaseException]] = []
     if _HTTPX_INSTALLED:
         exceptions.append(httpx.HTTPStatusError)
     if _REQUESTS_INSTALLED:
@@ -90,7 +84,7 @@ def get_default_http_status_exceptions() -> Tuple[
     return tuple(exceptions)
 
 
-def is_rate_limited(exc: Union[BaseException, None]) -> bool:
+def is_rate_limited(exc: Optional[BaseException]) -> bool:
     """Whether a given exception indicates the user has been rate limited.
 
     Args:
@@ -100,7 +94,10 @@ def is_rate_limited(exc: Union[BaseException, None]) -> bool:
         bool: Whether exc indicates rate limiting.
 
     """
-    if isinstance(exc, get_default_http_status_exceptions()):
+    if exc is None:
+        return False
+    exceptions = get_default_http_status_exceptions()
+    if isinstance(exc, exceptions) and hasattr(exc, "response"):
         return exc.response.status_code == 429
     return False
 
@@ -120,9 +117,12 @@ def is_server_error(
         bool: whether exc indicates an error included in status_codes.
 
     """
+    if exc is None:
+        return False
     if isinstance(status_codes, int):
         status_codes = [status_codes]
-    if isinstance(exc, get_default_http_status_exceptions()):
+    exceptions = get_default_http_status_exceptions()
+    if isinstance(exc, exceptions) and hasattr(exc, "response"):
         return exc.response.status_code in status_codes
     return False
 
diff --git a/retryhttp/_wait.py b/retryhttp/_wait.py
index d6ddec7..a4c1d53 100644
--- a/retryhttp/_wait.py
+++ b/retryhttp/_wait.py
@@ -68,7 +68,11 @@ def _get_wait_value(self, retry_state: RetryCallState) -> float:
         """
         if retry_state.outcome:
             exc = retry_state.outcome.exception()
-            if isinstance(exc, get_default_http_status_exceptions()):
+            if exc is None:
+                return 0
+            if isinstance(exc, get_default_http_status_exceptions()) and hasattr(
+                exc, "response"
+            ):
                 value = exc.response.headers.get(self.header)
                 if value is None:
                     raise ValueError(f"Header not present: {self.header}")