HEAD /registry-v2/docker/registry/v2/blobs/sha256/03/03f4658f8b782e12230c1783426bd3bacce651ce582a4ffb6fbbfa2079428ecb/data?Expires=1448527827&Signature=eTtmjwAr4PPoCAZoauFCz1e8cIZk3LBZUSdPxNnLJjTnExWY9HCOQt9HLn8sCT4hLm3HtDuGFqwGeuCimimfhJGCrHkL-~rEnlkh9jJPfdaBXt7PHBFBnEHWHgCJcuDfl7WRF8H6O4ELzekQ62rXiscI5mYVdK4sqg4zeSCH10Q_&Key-Pair-Id=APKAJECH5M7VWIS5YZ6Q HTTP/1.1 Host: dseasb33srnrn.cloudfront.net User-Agent: docker/1.8.1 go/go1.4.2 git-commit/d12ea79 kernel/3.13.0-63-generic os/linux arch/amd64 Referer: https://registry-1.docker.io/v2/library/hello-world/blobs/sha256:03f4658f8b782e12230c1783426bd3bacce651ce582a4ffb6fbbfa2079428ecb