生成腾讯云的鉴权签名的 Python 代码，一直验证失败，有没有使用过的大佬帮忙看一下？

根据文档提供的方法生成签名后，请求 API 一直返回 4100-验证失败。
有没有用过的大佬帮忙看看哪里出了问题？
参考的文档是这个： https://cloud.tencent.com/document/api/271/2053

谢谢

import requests import os import time import random import urllib.parse import hashlib import hmac import base64 # HmacSHA256 加密算法 def Hmac_SHA256(string, key): string_b = bytes(string, encoding="utf-8") key_b = bytes(key, encoding="utf-8") signature = base64.b64encode(hmac.new(key=key_b, msg=string_b, digestmod=hashlib.sha256).digest()) return signature.decode("utf-8") # 请求 API def req_api(): # 生成通用参数 nOnce= str(random.randint(1, 65535)) timestamp = str(int(time.time())) region = "sz" action = "TextSentiment" # 密钥 TX_SecretKey = os.getenv("TX_SecretKey") TX_SecretId = os.getenv("TX_SecretId") # 请求方式 method = "GET" # 组合字符串 url = "wenzhi.api.qcloud.com/v2/index.php" params = { "Action": action, "Nonce": nonce, "Region": region, "SecretId": TX_SecretId, "SignatureMethod": "HmacSHA256", "Timestamp": timestamp, } params_string = urllib.parse.urlencode(params) src_string = "{}{}?{}".format(method, url, params_string) print(src_string) # 使用 hamxsha256+base64 生成签名 sign_string = Hmac_SHA256(src_string, TX_SecretKey) print("Signature is {}".format(sign_string)) url = "https://wenzhi.api.qcloud.com/v2/index.php" params = { "Action": action, "Nonce": nonce, "Region": region, "SecretId": TX_SecretId, "Timestamp": timestamp, "Signature": sign_string, "content": "双万兆服务器就是好，只是内存小点", } respOnse= requests.get(url, params=params, verify=False) print(response.text) if __name__ == '__main__': req_api()