# File lib/webmock/http_lib_adapters/patron_adapter.rb, line 61
        def self.handle_file_name(req, webmock_response)
          if req.action == :get && req.file_name
            begin
              File.open(req.file_name, "w") do |f|
                f.write webmock_response.body
              end
            rescue Errno::EACCES
              raise ArgumentError.new("Unable to open specified file.")
            end
          end
        end