Always return error "user token expired" when use openAPI platform

[sukha-cn]

I used the demo code to get access token. When I upload a file, it always return "user token expired" message.

Here is the code:

import hashlib
import random
import time
import requests

def get_nonce():
    pool = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
    length = 10
    ret = ""

    while len(ret) < length:
        ret += random.choice(pool)
    return ret


ts = str(int(time.time()))
nonce = get_nonce()
access_key = "***"
secret_key = "***"

concat_string = "uri=/api/v1/openapi/auth&ts=%s&nonce=%s&accessKey=%s&secretKey=%s" % (ts, nonce, access_key, secret_key)
sign = hashlib.sha256(concat_string.encode("utf-8")).hexdigest()

url = "https://platform.openmmlab.com/gw/user-service/api/v1/openapi/auth"
headers = {
    "ts": ts,
    "nonce": nonce,
    "sign": sign,
    "accessKey": access_key
}
ret = requests.post(url, headers=headers)
print(ret.json())

url = "https://platform.openmmlab.com/gw/upload-service/api/v1/uploadFile"

params = {
    "key": "inference",
    "tag": "pose"
}

files = [
    ('file', ('', open('/Users/***/Documents/curry_shot.jpg', 'rb'), 'image/jpeg'))
]

headers = {
    "Authorization": ret.json()['data']['accessToken']
}

response = requests.request("POST", url, params=params, headers=headers, files=files)

print(response.text)

I replace my ak & sk with "***" here for security.

The whole return message is :

{"timestamp":"2025-01-08T02:09:56.576+0000","error":"Internal Server Error","msgCode":"A0202","status":401,"msg":"user token expired"}

I think maybe there is something wrong with the timestamp. But I don't know how to solve the problem.
Please help, thanks.