class Rack::Lint::Wrapper

def check_content_length_header(status, headers)
  headers.each { |key, value|
    if key == 'content-length'
      ## There must not be a <tt>content-length</tt> header key when the
      ## +Status+ is 1xx, 204, or 304.
      if Rack::Utils::STATUS_WITH_NO_ENTITY_BODY.key? status.to_i
        raise LintError, "content-length header found in #{status} response, not allowed"
      end
      @content_length = value
    end
  }
end