check_headers

# File lib/uri/mailto.rb, line 182
    def check_headers(v)
      return true unless v
      return true if v.size == 0

      if OPAQUE !~ v || 
          /\A(#{HEADER_PATTERN}(?:\&#{HEADER_PATTERN})*)\z/o !~ v
        raise InvalidComponentError,
          "bad component(expected opaque component): #{v}"
      end

      return true
    end