In correspondence to the topic under: https://groups.google.com/forum/?fromgroups=#!topic/foreman-users/Y91OfgTkg3c

The user is unable to upload facts to foreman on demand. Issuing the following code:

url="https://192.168.199.40:443" 

require 'fileutils'
require 'net/http'
require 'net/https'
require 'uri'
require 'facter'
require 'yaml'

#in order to get facts in a proper format
facts = `puppet facts --render-as yaml find host.domain`
begin
  uri = URI.parse(url)
  http = Net::HTTP.new(uri.host, uri.port)
  if uri.scheme == 'https' then
    http.use_ssl = true
    http.verify_mode = OpenSSL::SSL::VERIFY_NONE
  end
  req = Net::HTTP::Post.new("/fact_values/create")
  req.set_form_data({'facts' => facts})
  response = http.request(req)
rescue Exception => e
  raise "Could not send facts to Foreman: #{e}" 
end

Right now, as Ohad says: "we do check within foreman that the object we get is a serialized puppet facts, and I'm guessing we can relax that requirements to a simple facts hash, please open a new feature request and I'll have to resolve it"