moby: Error Getting a list of running containers

Output of docker version:

Client:
 Version:      1.12.1
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   f1e1b83
 Built:        
 OS/Arch:      linux/amd64

Server:
 Version:      1.12.1
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   f1e1b83
 Built:        
 OS/Arch:      linux/amd64

Output of docker info:

Containers: 2
 Running: 1
 Paused: 0
 Stopped: 1
Images: 2
Server Version: 1.12.1
Storage Driver: overlay
 Backing Filesystem: extfs
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge overlay null host
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Security Options: selinux
Kernel Version: 4.7.1-coreos
Operating System: CoreOS 1151.0.0 (MoreOS)
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 7.801 GiB
Name: core-01
ID: 3D66:DYWJ:CZIL:ESFB:CW3S:UTSG:VFZY:YBLT:E234:H7L2:OIOT:Y7ZL
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Username: easywebdeploy
Registry: https://index.docker.io/v1/
Insecure Registries:
 127.0.0.0/8

Additional environment details (AWS, VirtualBox, physical, etc.): Running CoreOS Alpha 1151.0.0 On Vagrant 1.8.5 Ubuntu 16.04

Steps to reproduce the issue:

1. Run a simple container and make sure its running
2. Run “curl -v --unix-socket /var/run/docker.sock http:/containers/json” to get a list of Containers

Describe the results you received:

*   Trying /var/run/docker.sock...
* Connected to containers (/var/run/docker.sock) port 80 (#0)
> GET /json HTTP/1.1
> Host: containers
> User-Agent: curl/7.50.1
> Accept: */*
> 
< HTTP/1.1 404 Not Found
< Content-Type: application/json
< Date: Mon, 29 Aug 2016 08:48:02 GMT
< Content-Length: 29
< 
{"message":"page not found"}
* Connection #0 to host containers left intact

Describe the results you expected: Expected is the JSON list of all running containers

Additional information you deem important (e.g. issue happens only occasionally): Was working correctly on CoreOS with Docker version till 1.11.2