You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: http_proxy.rb
    path of file: ./repos/foreman/app/controllers/concerns/foreman/controller/parameters
    
    the code of the file until where you have to start completion: module Foreman::Controller::Parameters::HttpProxy
  extend ActiveSupport::Concern
  include Forem
    
    def http_proxy_params_filter
      Foreman::ParameterFilter.new(::HttpProxy).tap do |filter|
        filter.permit_by_context :id, :name, :url, :username, :password, :cacert, :nested => true

        add_taxonomix_params_filter(filter)
      end
    end