为什么我做ai图像识别工具练习时，在获取Access Token时出现这个错误:

host = 'https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=' + API_KEY +'&client_secret=' + SECRET_KEY

# 发送请求

headers = {'user-agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36'}

content = requests.post(host,headers=headers)

#print(response.content.)

dd = content.content.decode('utf-8')

if (dd):

   print(dd)

结果:

{"error_description":"unknown client id","error":"invalid_client"}

应该怎样做，请高手教教我

qq:27617817