Fixed: NameError: name 'locale_encoding' is not defined File /bin/rst2html.py, line 17, in <module> from docutils.core import publish_cmdline, default_description File /usr/lib/python2.7/site-packages/docutils/core.py, line 20, in <module> from docutils import frontend, io, utils, readers, writers File /usr/lib/python2.7/site-packages/docutils/frontend.py, line 41, in <module> import docutils.utils File /usr/lib/python2.7/site-packages/docutils/utils/__init__.py, line 20, in <module> import docutils.io File /usr/lib/python2.7/site-packages/docutils/io.py, line 18, in <module> from docutils.utils.error_reporting import locale_encoding, ErrorString, ErrorOutput File /usr/lib/python2.7/site-packages/docutils/utils/error_reporting.py, line 60, in <module> codecs.lookup(locale_encoding or '') # None -> '' NameError: name 'locale_encoding' is not defined

.. -*- coding: utf-8; -*-

============
 Host names
============
.. contents::
   :local:

What characters may be used for host name?
==========================================

As say RFC 952 hostname is a text string up to 24 characters drawn from the alphabet
(A-Z), digits (0-9), minus sign (-), and period (.).

As say RFC 1035::

  <domain> ::= <subdomain> | " "

  <subdomain> ::= <label> | <subdomain> "." <label>

  <label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]

  <ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>

  <let-dig-hyp> ::= <let-dig> | "-"

  <let-dig> ::= <letter> | <digit>

  <letter> ::= any one of the 52 alphabetic characters A through Z in
  upper case and a through z in lower case

  <digit> ::= any one of the ten digits 0 through 9