Comment 2 for bug 1518712

I have tested this and it does not seem to be working:

~~~
heat_template_version: 2014-10-16

description: A hot template for provisioning an Glance Image

parameters:

  image_name:
    type: string
    default: "Fedora23"

  container_format:
    type: string
    default: "bare"
    constraints:
      - allowed_values: [ "ami", "ari", "aki", "bare", "ova", "ovf"]

  disk_format:
    type: string
    default: "qcow2"
    constraints:
      - allowed_values: [ "ami", "ari", "aki", "vhd", "vmdk", "raw", "qcow2", "vdi", "iso" ]

  location:
    type: string
    #default: "http://USER:<email address hidden>/private/Fedora-Cloud-Base-23-20151030.x86_64.qcow2"
    #default: "http://OPENSTACK.ENV.com/private/Fedora-Cloud-Base-23-20151030.x86_64.qcow2"
    default: "https://download.fedoraproject.org/pub/fedora/linux/releases/23/Cloud/x86_64/Images/Fedora-Cloud-Base-23-20151030.x86_64.qcow2"

  public:
    type: boolean
    default: false

  protected:
    type: boolean
    default: false

  disk_min:
    type: number
    default: 0

  ram_min:
    type: number
    default: 0

resources:

  image:
    type: OS::Glance::Image
    properties:
      container_format: {get_param: container_format}
      disk_format: {get_param: disk_format}
      is_public: {get_param: public}
      location: {get_param: location}
      min_disk: {get_param: disk_min}
      min_ram: {get_param: ram_min}
      name: {get_param: image_name}
      protected: {get_param: protected}

outputs:
 image_name:
    description: Image Name
    value: { get_param: image_name}
~~~

And as an example the following httpd configuration:

~~~
Alias "/private" "/var/www/test/"
<Directory /var/www/test/>
#<Location "/private">
    #DocumentRoot "/var/www/test/"
    AuthType Basic
    AuthName "Secure"
    AuthBasicProvider file
    AuthUserFile /etc/httpd/test_password
    Order allow,deny
    Allow from all
    Require valid-user
#</Location>
</Directory>
# htpasswd -c /etc/httpd/test_password USER
~~~

With this in place all variations of the location allow for the stack to be created (complete), however only the 3rd (the uncommented) options actually creates an image that is usable.