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: file.rb
    path of file: ./repos/mechanize/lib/mechanize
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
##
# This is the base class for the P
    
  def initialize uri = nil, response = nil, body = nil, code = nil
    @uri  = uri
    @body = body
    @code = code

    @full_path = false unless defined? @full_path

    fill_header response
    extract_filename

    yield self if block_given?
  end