sub_app = FastAPI()
captured_exception = ExceptionCapture()

app.mount(path="/sub", app=sub_app)


@app.exception_handler(RequestValidationError)
@sub_app.exception_handler(RequestValidationError)
async def request_validation_handler(request: Request, exc: RequestValidationError):
    captured_exception.capture(exc)
    raise exc


@app.exception_handler(ResponseValidationError)
@sub_app.exception_handler(ResponseValidationError)