Resolve typo and change to Literal

Co-authored-by: Aima Ovai <[email protected]> Co-authored-by: James King <[email protected]>
frankie567 · Feb 5, 2024 · 8b304ce · 8b304ce
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diff --git a/docs/oauth2.md b/docs/oauth2.md
@@ -30,7 +30,7 @@ Returns the authorization URL where you should redirect the user to ask for thei
     * `state: str = None`: Optional string that will be returned back in the callback parameters to allow you to retrieve state information.
     * `scope: Optional[List[str]] = None`: Optional list of scopes to ask for.
     * `code_challenge: Optional[str] = None`: Optional code_challenge in a [PKCE context](https://datatracker.ietf.org/doc/html/rfc7636).
-    * `code_challenge_method: ptional[str] = None`: Optional code_challenge_method in a [PKCE context](https://datatracker.ietf.org/doc/html/rfc7636).
+    * `code_challenge_method: Optional[str] = None`: Optional code_challenge_method in a [PKCE context](https://datatracker.ietf.org/doc/html/rfc7636).
     * `extras_params: Optional[Dict[str, Any]] = None`: Optional dictionary containing parameters specific to the service.
 
 !!! example

diff --git a/httpx_oauth/oauth2.py b/httpx_oauth/oauth2.py
@@ -6,6 +6,7 @@
     Generic,
     List,
     Optional,
+    Literal,
     Tuple,
     TypeVar,
     cast,
@@ -101,7 +102,7 @@ async def get_authorization_url(
         state: Optional[str] = None,
         scope: Optional[List[str]] = None,
         code_challenge: Optional[str] = None,
-        code_challenge_method: Optional[str] = None,
+        code_challenge_method: Literal['plain', 'S256'] = None,
         extras_params: Optional[T] = None,
     ) -> str:
         params = {