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: request_proxy.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/oauth-0.5.3/lib/oauth
    
    the code of the file until where you have to start completion: module OAuth
  module RequestProxy
    def self.available_proxies #:nodoc:
      @available_proxies ||= {}
    end

    def self.proxy(request, options = {})

    
    def self.proxy(request, options = {})
      return request if request.kind_of?(OAuth::RequestProxy::Base)

      klass = available_proxies[request.class]

      # Search for possible superclass matches.
      if klass.nil?
        request_parent = available_proxies.keys.find { |rc| request.kind_of?(rc) }
        klass = available_proxies[request_parent]
      end