diff --git a/github/GithubException.py b/github/GithubException.py
index 717102ca..42f50d2c 100644
--- a/github/GithubException.py
+++ b/github/GithubException.py
@@ -27,7 +27,6 @@
 # along with PyGithub. If not, see <http://www.gnu.org/licenses/>.             #
 #                                                                              #
 ################################################################################
-
 import json
 from typing import Any, Dict, List, Optional, Tuple, Type, Union
 
@@ -42,14 +41,20 @@ class GithubException(Exception):
     def __init__(
         self,
         status: int,
-        data: Union[str, Dict[str, Union[str, List[str], List[Dict[str, str]]]]],
-        headers: Optional[Dict[str, str]],
+        data: Any = None,
+        headers: Optional[Dict[str, str]] = None,
+        message: Optional[str] = None,
     ):
         super().__init__()
         self.__status = status
         self.__data = data
         self.__headers = headers
-        self.args = (status, data, headers)
+        self.__message = message
+        self.args = (status, data, headers, message)
+
+    @property
+    def message(self) -> Optional[str]:
+        return self.__message
 
     @property
     def status(self) -> int:
@@ -59,9 +64,7 @@ class GithubException(Exception):
         return self.__status
 
     @property
-    def data(
-        self,
-    ) -> Union[str, Dict[str, Union[str, List[str], List[Dict[str, str]]]]]:
+    def data(self) -> Any:
         """
         The (decoded) data returned by the Github API
         """
@@ -74,8 +77,19 @@ class GithubException(Exception):
         """
         return self.__headers
 
+    def __repr__(self) -> str:
+        return f"{self.__class__.__name__}({self.__str__()})"
+
     def __str__(self) -> str:
-        return f"{self.status} {json.dumps(self.data)}"
+        if self.__message:
+            msg = f"{self.__message}: {self.status}"
+        else:
+            msg = f"{self.status}"
+
+        if self.data is not None:
+            msg += " " + json.dumps(self.data)
+
+        return msg
 
 
 class BadCredentialsException(GithubException):
diff --git a/github/GithubObject.py b/github/GithubObject.py
index 304ceb33..2717cde2 100644
--- a/github/GithubObject.py
+++ b/github/GithubObject.py
@@ -403,7 +403,7 @@ class CompletableGithubObject(GithubObject):
 
     def __complete(self):
         if self._url.value is None:
-            raise IncompletableObject(400, "Returned object contains no URL", None)
+            raise IncompletableObject(400, message="Returned object contains no URL")
         headers, data = self._requester.requestJsonAndCheck("GET", self._url.value)
         self._storeAndUseAttributes(headers, data)
         self.__completed = True
diff --git a/github/Requester.py b/github/Requester.py
index 429cf075..532f5c5d 100644
--- a/github/Requester.py
+++ b/github/Requester.py
@@ -538,7 +538,7 @@ class Requester:
         status: int,
         headers: Dict[str, Any],
         output: Dict[str, Any],
-    ) -> Any:
+    ) -> GithubException.GithubException:
         message = output.get("message", "").lower() if output is not None else ""
 
         exc = GithubException.GithubException
diff --git a/tests/Requester.py b/tests/Requester.py
index 926a61ea..5c1b0576 100644
--- a/tests/Requester.py
+++ b/tests/Requester.py
@@ -344,7 +344,7 @@ class Requester(Framework.TestCase):
             with self.subTest(status=status):
                 exc = self.g._Github__requester.createException(status, {}, None)
                 self.assertException(
-                    exc, github.GithubException, status, None, {}, f"{status} null"
+                    exc, github.GithubException, status, None, {}, f"{status}"
                 )