# File lib/heroku/client.rb, line 274
    def transition(action)
      @response = @client.put(
        "/apps/#{@app}/services/#{@upid}",
        action,
        :content_type => 'text/plain'
      ).to_s
      self
    rescue RestClient::RequestFailed => e
      raise AppCrashed, e.http_body  if e.http_code == 502
      raise
    end