微信回调域名校验错误

from flask import Flask, request, make_response
import hashlib

app = Flask(__name__)

@app.route('/wechat', methods=['GET'])
def wechat_verify():
    token = 'your_token_here'  # 替换为你的微信Token
    signature = request.args.get('signature', '')
    timestamp = request.args.get('timestamp', '')
    nonce = request.args.get('nonce', '')
    echostr = request.args.get('echostr', '')

    # 将token、timestamp、nonce三个参数进行字典序排序
    tmp_list = [token, timestamp, nonce]
    tmp_list.sort()
    tmp_str = ''.join(tmp_list)

    # 将三个参数字符串拼接成一个字符串进行sha1加密
    sha1 = hashlib.sha1()
    sha1.update(tmp_str.encode('utf-8'))
    hash_str = sha1.hexdigest()

    # 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信
    if hash_str == signature:
        return make_response(echostr)
    else:
        return 'fail'

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=80)