'Unauthorized' error message outputted before customaized error handler in '@auth()'

[ockan]

I code

@app.exception_handler(404)
@app.exception_handler(500)
@app.exception_handler(403)
@app.exception_handler(401)
async def all_error(appl, request, exc):
    context = {'status_code': exc.status, 'message': exc.args[0]}
    return await view_async("err.html", **context)

but if @auth() failed, a message ''Unauthorized' directly output to the browser, not my customaized renderring page.