Fix token introspection link (should be 401)

src/oidc_test/main.py

@@ -281,9 +281,10 @@ async def get_introspect(
     token: Annotated[OAuth2Token, Depends(get_token)],
 ) -> JSONResponse:
     if (
-        response := await provider.get(
+        response := await provider.post(
             provider.server_metadata["introspection_endpoint"],
             token=token,
+            data={"token": token["access_token"]},
         )
     ).is_success:
         return response.json()

src/oidc_test/templates/home.html

@@ -110,7 +110,7 @@
       <a href="fast_api_depends" class="hidden">Using FastAPI Depends</a>
       <a href="other">Other</a>
       <a href="oauth2-forgejo-test">OAuth2 test (forgejo user info)</a>
-      <a href="introspect">Introspect token</a>
+      <a href="introspect">Introspect token (401 expected)</a>
     </div>
   {% if user_info_details %}
     <div class="debug-auth">