Proxy is set via environment variable.
# docker search strider
2013/09/11 07:44:18 Error: Get https://index.docker.io/v1/search?q=strider: EOF
# curl https://index.docker.io/v1/search?q=strider
{"query": "strider", "num_results": 3, "results": [...]}
# docker pull base
Pulling repository base
2013/09/11 07:46:31 Get https://index.docker.io/v1/images/base/ancestry: EOF