diff --git a/antarest/eventbus/web.py b/antarest/eventbus/web.py
index cae0ffb99f..d7675b20ec 100644
--- a/antarest/eventbus/web.py
+++ b/antarest/eventbus/web.py
@@ -91,7 +91,7 @@ async def send_event_to_ws(event: Event) -> None:
     @application.websocket("/ws")
     async def connect(
         websocket: WebSocket,
-        token: str = Query(...),
+        token: str = Query(),
         jwt_manager: AuthJWT = Depends(),
     ) -> None:
         user: Optional[JWTUser] = None
diff --git a/antarest/launcher/web.py b/antarest/launcher/web.py
index a4a1c45ba6..4bb21db540 100644
--- a/antarest/launcher/web.py
+++ b/antarest/launcher/web.py
@@ -201,23 +201,7 @@ def get_load(
         response_model=List[str],
     )
     def get_solver_versions(
-        solver: str = Query(
-            "default",
-            examples={
-                "Default solver": {
-                    "description": "Get the solver versions of the default configuration",
-                    "value": "default",
-                },
-                "SLURM solver": {
-                    "description": "Get the solver versions of the SLURM server if available",
-                    "value": "slurm",
-                },
-                "Local solver": {
-                    "description": "Get the solver versions of the Local server if available",
-                    "value": "local",
-                },
-            },
-        )
+        solver: str = Query("default", examples=["default", "slurm", "local"]),
     ) -> List[str]:
         """
         Get list of supported solver versions defined in the configuration.
diff --git a/antarest/study/web/study_data_blueprint.py b/antarest/study/web/study_data_blueprint.py
index de9fbcecd1..69bf5ba62b 100644
--- a/antarest/study/web/study_data_blueprint.py
+++ b/antarest/study/web/study_data_blueprint.py
@@ -1017,23 +1017,7 @@ def set_allocation_form_fields(
     )
     def get_correlation_matrix(
         uuid: str,
-        columns: Optional[str] = Query(
-            None,
-            examples={
-                "all areas": {
-                    "description": "get the correlation matrix for all areas (by default)",
-                    "value": "",
-                },
-                "single area": {
-                    "description": "get the correlation column for a single area",
-                    "value": "north",
-                },
-                "selected areas": {
-                    "description": "get the correlation columns for a selected list of areas",
-                    "value": "north,east",
-                },
-            },
-        ),  # type: ignore
+        columns: str = Query("", examples=["", "north", "north,east"]),
         current_user: JWTUser = Depends(auth.get_current_user),
     ) -> CorrelationMatrix:
         """
@@ -1058,11 +1042,8 @@ def get_correlation_matrix(
             study_service.get_all_areas(uuid, area_type=AreaType.AREA, ui=False, params=params),
         )
         manager = CorrelationManager(study_service.storage_service)
-        return manager.get_correlation_matrix(
-            all_areas,
-            study,
-            columns.split(",") if columns else [],
-        )
+        cols = columns.split(",") if columns else []
+        return manager.get_correlation_matrix(all_areas, study, cols)
 
     @bp.put(
         path="/studies/{uuid}/areas/hydro/correlation/matrix",