parse

# File lib/soap/mimemessage.rb, line 122
    def parse(str)
      headers, body = str.split(/\r\n\r\n/s)
      if headers != nil and body != nil
        @headers = Headers.parse(headers)
        @body = body.sub(/\r\n\z/, '')
      else
        raise RuntimeError.new("unexpected part: #{str.inspect}")
      end
      self
    end