# File lib/faraday_middleware/response/caching.rb, line 45
    def cache_key(env)
      url = env[:url].dup
      if url.query && params_to_ignore.any?
        params = parse_query url.query
        params.reject! {|k,| params_to_ignore.include? k }
        url.query = build_query params
      end
      url.normalize!
      url.request_uri
    end