Running

curl http://puppet.foo.com:3000/hosts/host.foo.com/puppetrun

ActionController::RedirectBackError (No HTTP_REFERER was set in the request to this action, so redirect_to :back could not be called successfully. If this is a test, make sure to specify request.env["HTTP_REFERER"].):
  app/controllers/hosts_controller.rb:211:in `puppetrun'
  /usr/lib/ruby/1.8/mongrel.rb:159:in `process_client'
  /usr/lib/ruby/1.8/mongrel.rb:158:in `each'
  /usr/lib/ruby/1.8/mongrel.rb:158:in `process_client'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `run'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `initialize'
  /usr/lib/ruby/1.8/mongrel.rb:285

Rendering /usr/share/foreman/public/500.html (500 Internal Server Error)
Processing HostsController#puppetrun (for 1.2.3.4 at 2011-02-16 12:55:35) [GET]
  Parameters: {"action"=>"puppetrun", "id"=>"host.foo.com", "controller"=>"hosts"}

ActionController::RedirectBackError (No HTTP_REFERER was set in the request to this action, so redirect_to :back could not be called successfully. If this is a test, make sure to specify request.env["HTTP_REFERER"].):
  app/controllers/hosts_controller.rb:211:in `puppetrun'
  /usr/lib/ruby/1.8/mongrel.rb:159:in `process_client'
  /usr/lib/ruby/1.8/mongrel.rb:158:in `each'
  /usr/lib/ruby/1.8/mongrel.rb:158:in `process_client'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `run'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `initialize'
  /usr/lib/ruby/1.8/mongrel.rb:285

Rendering /usr/share/foreman/public/500.html (500 Internal Server Error)

The run completes successfully however.