Webhook URL cannot be verified.

I use the codes in my project directly and I deploy my project onHeroku successfully.

The codes what I use is:

from flask import Flask, request, abort

from linebot import (
    LineBotApi, WebhookHandler
)
from linebot.exceptions import (
    InvalidSignatureError
)
from linebot.models import (
    MessageEvent, TextMessage, TextSendMessage,
)

app = Flask(__name__)

line_bot_api = LineBotApi('YOUR_CHANNEL_ACCESS_TOKEN')   #I put my 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:
        abort(400)

    return 'OK'


@handler.add(MessageEvent, message=TextMessage)
def handle_message(event):
    line_bot_api.reply_message(
        event.reply_token,
        TextSendMessage(text=event.message.text))


if __name__ == "__main__":
    app.run()

But the error appeared like that:

https://intense-anchorage-90708.herokuapp.com/callback A http status of the response was ‘500 INTERNAL SERVER ERROR’.

I need your help. Thanks a lot.

[be-hase]

Do you press the verify-button in the Developer Center?

This “Verify” means verifying SSL certificate. When you click this verify-button, LINE server sends a dummy webhook. And reply token included webhook is also dummy. So, it is impossible to call reply API.

[BibekStha123]

Thank you be-hase.