title: Can not pull/push images after update docker to 1.12
body: <p>The private registry was worked well based on docker 1.10.3,but I can not pull/push images after the docker updated to 1.12.0.</p>
  
  <p>I had modified the /etc/sysconfig/docker as:</p>
  
  <pre><code>OPTIONS='--selinux-enabled=true --insecure-registry=myip:5000'
  </code></pre>
  
  <p>or</p>
  
  <pre><code>OPTIONS='--selinux-enabled=true --insecure-registry myip:5000'
  </code></pre>
  
  <p>but when I exec pull/push,I got this error:</p>
  
  <pre><code>$ docker pull myip:5000/cadvisor
  Using default tag: latest
  Error response from daemon: Get https://myip:5000/v1/_ping: http: server gave HTTP response to HTTPS client
  </code></pre>
  
  <p>when I change back docker to 1.10.3, it still work well as below:</p>
  
  <pre><code>$ docker pull myip:5000/cadvisor
  Using default tag: latest
  Trying to pull repository myip:5000/cadvisor ... 
  latest: Pulling from myip:5000/cadvisor
  09d0220f4043: Pull complete 
  a3ed95caeb02: Pull complete 
  151807d34af9: Pull complete 
  14cd28dce332: Pull complete     
  Digest:
  sha256:33b6475cd5b7646b3748097af1224de3eee3ba7cf5105524d95c0cf135f59b47
  Status: Downloaded newer image for myip/cadvisor:latest
  </code></pre>
  
  <p>Some relative information are listed below:</p>
  
  <pre><code>docker version
  Client:
  Version: 1.12.0
  API version: 1.24
  Go version: go1.6.3
  Git commit: 8eab29e
  Built:
  
  OS/Arch: linux/amd64
  
  Server:
  Version: 1.12.0
  API version: 1.24
  Go version: go1.6.3
  Git commit: 8eab29e
  Built:
  
  OS/Arch: linux/amd64
  
  docker info
  Containers: 4
  Running: 1
  Paused: 0
  Stopped: 3
  Images: 241
  Server Version: 1.12.0
  Storage Driver: devicemapper
  Pool Name: docker-253:0-6809-pool
  Pool Blocksize: 65.54 kB
  Base Device Size: 107.4 GB
  Backing Filesystem: xfs
  Data file: /dev/loop0
  Metadata file: /dev/loop1
  Data Space Used: 5.459 GB
  Data Space Total: 107.4 GB
  Data Space Available: 34.74 GB
  Metadata Space Used: 9.912 MB
  Metadata Space Total: 2.147 GB
  Metadata Space Available: 2.138 GB
  Thin Pool Minimum Free Space: 10.74 GB
  Udev Sync Supported: true
  Deferred Removal Enabled: false
  Deferred Deletion Enabled: false
  Deferred Deleted Device Count: 0
  Data loop file: /var/lib/docker/devicemapper/devicemapper/data
  WARNING: Usage of loopback devices is strongly discouraged for production use. Use '--storage-opt dm.thinpooldev' to specify a custom block storage device.
  Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
  Library Version: 1.02.107-RHEL7 (2016-06-09)
  Logging Driver: json-file
  Cgroup Driver: cgroupfs
  Plugins:
  Volume: local
  Network: host overlay null bridge
  Swarm: inactive
  Runtimes: runc
  Default Runtime: runc
  Security Options: seccomp
  Kernel Version: 3.10.0-229.el7.x86_64
  Operating System: CentOS Linux 7 (Core)
  OSType: linux
  Architecture: x86_64
  CPUs: 24
  Total Memory: 62.39 GiB
  Name: server_3
  ID: TITS:BL4B:M5FE:CIRO:5SW6:TVIV:HW36:J7OS:WLHF:46T6:2RBA:WCNV
  Docker Root Dir: /var/lib/docker
  Debug Mode (client): false
  Debug Mode (server): true
  File Descriptors: 21
  Goroutines: 32
  System Time: 2016-08-02T10:33:06.414048675+08:00
  EventsListeners: 0
  Registry: https://index.docker.io/v1/
  WARNING: bridge-nf-call-iptables is disabled
  WARNING: bridge-nf-call-ip6tables is disabled
  Insecure Registries:
  127.0.0.0/8
  
  docker exec &lt;registry-container&gt; registry -version
  registry github.com/docker/distribution v2.2.1
  </code></pre>
  
  <p>After I restart the docker daemon in debug mode, the daemon logs when reproducing my problem are listed below:</p>
  
  <pre><code>DEBU[0794] Calling POST /v1.24/images/create?fromImage=10.10.10.40%3A5000%2Fcadvisor&amp;tag=latest 
  DEBU[0794] hostDir: /etc/docker/certs.d/10.10.10.40:5000 
  DEBU[0794] hostDir: /etc/docker/certs.d/10.10.10.40:5000 
  DEBU[0794] Trying to pull 10.10.10.40:5000/cadvisor from https://10.10.10.40:5000 v2 
  WARN[0794] Error getting v2 registry: Get https://10.10.10.40:5000/v2/: http: server gave HTTP response to HTTPS client 
  ERRO[0794] Attempting next endpoint for pull after error: Get https://10.10.10.40:5000/v2/: http: server gave HTTP response to HTTPS client
  DEBU[0794] Trying to pull 10.10.10.40:5000/cadvisor from https://10.10.10.40:5000 v1 
  DEBU[0794] hostDir: /etc/docker/certs.d/10.10.10.40:5000
  DEBU[0794] attempting v1 ping for registry endpoint https://10.10.10.40:5000/v1/
  DEBU[0794] Fallback from error: Get https://10.10.10.40:5000/v1/_ping: http: server gave HTTP response to HTTPS client 
  ERRO[0794] Attempting next endpoint for pull after error: Get https://10.10.10.40:5000/v1/_ping: http: server gave HTTP response to HTTPS client
  ERRO[0794] Handler for POST /v1.24/images/create returned error: Get https://10.10.10.40:5000/v1/_ping: http: server gave HTTP response to HTTPS client 
  DEBU[1201] clean 2 unused exec commands
  </code></pre>
  
  <p>What's more, I just run a simple command to launch the private registry for test, anything else is by default:</p>
  
  <pre><code>docker run -d -p 5000:5000 --restart=always --name registry -v 'pwd'/data:/var/lib/registry registry:2
  </code></pre>
  
  <p>No proxy is configured. In summary, it is only a quiet sample environment for test.</p>