该问题可能是API请求未正确设置造成的。以下是一个设置请求参数的示例代码：

import requests
from requests.auth import AuthBase

class AWSSigV4Auth(AuthBase):
    def __init__(self, access_key, secret_key, region, service):
        self.access_key = access_key
        self.secret_key = secret_key
        self.region = region
        self.service = service

    def __call__(self, r):
        # create a new request with the required headers
        import datetime, hashlib, hmac
        method = r.method
        endpoint = r.url
        headers = r.headers
        if 'date' not in headers:
            headers['date'] = datetime.datetime.utcnow().strftime('%a, %d %b %Y %H:%M:%S GMT')
        # Step 1: create canonical request
        canonical_uri = '/'
        canonical_querystring = ''
        canonical_headers = ''
        signed_headers = ''
        payload_hash = hashlib.sha256(('' if r.body is None else r.body).encode('utf-8')).hexdigest()
        canonical_request = '\n'.join([
            method.upper(), canonical_uri, canonical_querystring, canonical_headers, signed_headers, payload_hash])
        # Step 2: create string to sign
        algorithm = 'AWS4-HMAC-SHA256'
        credential_scope = '/'.join([
            headers['date'][0:8],
            self.region,
            self.service,
            'aws4_request',
        ])
        string_to_sign = '\n'.join([
            algorithm,
            headers['date'],
            credential_scope,
            hashlib.sha256(canonical_request.encode('utf-8')).hexdigest(),
        ])
        # Step 3: calculate signature
        kDate = hmac.new(('AWS4'+self.secret_key).encode('utf-8'), headers['date'][0:8].encode('utf-8'), hashlib.sha256).digest()
        kRegion = hmac.new(kDate, self.region.encode('utf-8'), hashlib.sha256).digest()
        kService = hmac.new(kRegion, self.service.encode('utf-8'), hashlib.sha256).digest()
        kSigning = hmac.new(kService, b'aws4_request', hashlib.sha256).