在Google App Engine中下载文件的位置？

from google.cloud import storage

def download_blob(bucket_name, source_blob_name, destination_file_name):
    """Downloads a blob from the bucket."""
    storage_client = storage.Client()
    bucket = storage_client.bucket(bucket_name)
    blob = bucket.blob(source_blob_name)

    blob.download_to_filename(destination_file_name)

    print(f'Blob {source_blob_name} downloaded to {destination_file_name}.')

from google.cloud import storage

def generate_signed_url(bucket_name, blob_name):
    """Generates a signed URL for the given blob."""
    storage_client = storage.Client()
    bucket = storage_client.bucket(bucket_name)
    blob = bucket.blob(blob_name)

    url = blob.generate_signed_url(version="v4", expiration=timedelta(minutes=15), method="GET")

    print(f'Signed URL: {url}')
    return url