都有改
有試過明碼跟加密兩種 還是持續出錯

line_bot_api = LineBotApi('YOUR_CHANNEL_ACCESS_TOKEN')
handler = WebhookHandler('YOUR_CHANNEL_SECRET')


@app.route("/callback", methods=['POST'])
def callback():
    # get X-Line-Signature header value
    signature = request.headers['X-Line-Signature']

    # get request body as text
    body = request.get_data(as_text=True)
    app.logger.info("Request body: " + body)

    # handle webhook body
    try:
        handler.handle(body, signature)
    except InvalidSignatureError:
        print("Invalid signature. Please check your channel access token/channel secret.")
        abort(400)

    return 'OK'

照github readme來看，出現400除了token和channel secret有問題以外，不會有其他狀況

請到 Line Developer 網站查看是否使用正確的金鑰

請問line有SSL白名單嗎?怎麼檢查line會不會接受?
我是在sslforfree申請
https://ithelp.ithome.com.tw/upload/images/20210124/20107184ulJZrP1Crn.png

請問line有SSL白名單嗎?怎麼檢查line會不會接受?
我有找到一份名單,我的根簽發機構不在名單上,是這個原因?
https://developers.line.biz/media/messaging-api/build-bot/ca_root_v2.txt

換用letsencrypt看看