Implement exception handler

core/scripts/webpanel/exception_handler/__init__.py

@@ -0,0 +1 @@
+from .handler import setup_exception_handler

core/scripts/webpanel/exception_handler/handler.py

@@ -0,0 +1,20 @@
+from fastapi import FastAPI, HTTPException, Request
+from fastapi.responses import JSONResponse
+from pydantic import BaseModel
+
+
+class JSONErrorResponse(BaseModel):
+    status: int
+    detail: str
+
+
+def setup_exception_handler(app: FastAPI):
+    '''
+    Setup exception handler for FastAPI.
+    '''
+    @app.exception_handler(Exception)
+    async def http_exception_handler(request: Request, exc: HTTPException):  # type: ignore
+        return JSONResponse(
+            status_code=exc.status_code,
+            content=JSONErrorResponse(status=exc.status_code, detail=exc.detail).model_dump(),
+        )