No Signature at the end of url using digital ocean cdn in django

This is my configutation

AWS_ACCESS_KEY_ID = 'keyid'
AWS_SECRET_ACCESS_KEY = 'accesskey'
AWS_STORAGE_BUCKET_NAME = 'allio1'
AWS_S3_ENDPOINT_URL = 'https://sfo3.digitaloceanspaces.com'
AWS_S3_CUSTOM_DOMAIN = 'allio1.sfo3.cdn.digitaloceanspaces.com'
AWS_DEFAULT_ACL = None
AWS_S3_OBJECT_PARAMETERS = {
    'CacheControl': 'max-age=86400',
}
AWS_LOCATION = 'allio-static'
# AWS_DEFAULT_ACL = 'public-read'

STATICFILES_STORAGE = 'storages.backends.s3boto3.S3Boto3Storage'

STATIC_URL = '{}/{}/'.format(AWS_S3_CUSTOM_DOMAIN, AWS_LOCATION)
STATIC_ROOT = 'static/'

STATICFILES_STORAGE = 'storages.backends.s3boto3.S3Boto3Storage'
DEFAULT_FILE_STORAGE = 'storages.backends.s3boto3.S3Boto3Storage'

There is no signature at the end of the url. It is just plain url for example https://allio1.sfo3.cdn.digitaloceanspaces.com/allio-static/assets/bootstrap/css/bootstrap.min.css There is no signature at the end of url and it says access denied