# File lib/addressable/uri.rb, line 922
    def self.port_mapping
      @port_mapping ||= {
        "http" => 80,
        "https" => 443,
        "ftp" => 21,
        "tftp" => 69,
        "sftp" => 22,
        "ssh" => 22,
        "svn+ssh" => 22,
        "telnet" => 23,
        "nntp" => 119,
        "gopher" => 70,
        "wais" => 210,
        "ldap" => 389,
        "prospero" => 1525
      }
    end