描述：在拉取镜像时，一直处于等待状态，等待了几十秒后，抛出异常：
error pulling image configuration: Get https://dseasb33srnrn.cloudfront.net/registry-v2/docker/registry/v2/blobs/sha256/d8/d8f08f881e97b6d9f92869887bf5c283c841827e2ce8542207db3fbbe0cf29a2/data?Expires=1522360411&Signature=EhzTBCUvgGMTTX0HVUZbO0waQ6XBEwe13LhGYpVUEZacP3eU--DjR-YCeerQnpb3ZKJmapikxNGiHwK1RBsWZ4SnA2exCc4wZLMhRC88Z8euCvQ7YU0SOhQruChIWezYDbGiWC2sYMmqMdLbHbK8JP9ZCu34hI~iBCISXLHxX0M_&Key-Pair-Id=APKAJECH5M7VWIS5YZ6Q: net/http: TLS handshake timeouterror pullin
