parse_uri

# File lib/webrick/httprequest.rb, line 252
    def parse_uri(str, scheme="http")
      if @config[:Escape8bitURI]
        str = HTTPUtils::escape8bit(str)
      end
      uri = URI::parse(str)
      return uri if uri.absolute?
      if self["host"]
        pattern = /\A(#{URI::REGEXP::PATTERN::HOST})(?::(\d+))?\z/n
        host, port = *self['host'].scan(pattern)[0]
      elsif @addr.size > 0
        host, port = @addr[2], @addr[1]
      else
        host, port = @config[:ServerName], @config[:Port]
      end
      uri.scheme = scheme
      uri.host = host
      uri.port = port ? port.to_i : nil
      return URI::parse(uri.to_s)
    end