Add support for handling several exceptions with the same handler

fastapi/applications.py

@@ -4539,7 +4539,7 @@ class FastAPI(Starlette):
 
     def exception_handler(
         self,
-        exc_class_or_status_code: Annotated[
+        *exc_classes_or_status_codes: Annotated[
             Union[int, Type[Exception]],
             Doc(
                 """
@@ -4565,11 +4565,13 @@ class FastAPI(Starlette):
             def __init__(self, name: str):
                 self.name = name
 
+        class AnotherUnicornException(Exception)
+            def __init__(self, name: str):
+                self.name = name
 
         app = FastAPI()
 
-
-        @app.exception_handler(UnicornException)
+        @app.exception_handler(UnicornException, AnotherUnicornException)
         async def unicorn_exception_handler(request: Request, exc: UnicornException):
             return JSONResponse(
                 status_code=418,
@@ -4577,9 +4579,9 @@ class FastAPI(Starlette):
             )
         ```
         """
-
-        def decorator(func: DecoratedCallable) -> DecoratedCallable:
-            self.add_exception_handler(exc_class_or_status_code, func)
-            return func
+        for exc_class_or_status_code in exc_classes_or_status_codes:
+            def decorator(func: DecoratedCallable) -> DecoratedCallable:
+                self.add_exception_handler(exc_class_or_status_code, func)
+                return func
 
         return decorator