[chef] http_request bug?

[Brian Akins < >]

I have a simple LWRP based on the code from the wiki:
http://wiki.opscode.com/display/chef/Resources#Resources-HTTPRequest
for doing a head request with if-modified-since to conditionally
trigger a remote_file.  This now triggers every time since upgrading
to 10.14. Is this a known issue?

Sample simplified LWRP provider code:

action :create do
  remote_file new_resource.path do
    owner new_resource.owner
    group new_resource.group
    mode new_resource.mode
    source new_resource.source
    action :nothing
  end

 http_request "HEAD #{new_resource.source}" do
    message ""
    url new_resource.source
    action :head
    if ::File.exists?(new_resource.path)
      headers "If-Modified-Since" => ::File.mtime(new_resource.path).httpdate
    end
    notifies :create, resources(:remote_file => new_resource.path), 
:immediately
  end
end