CPAN: http://www.cpan.org/
libwww: http://www.linpro.no/lwp/
SSLeay: FAQ: http://psych.psy.uq.oz.au/~ftp/Crypto/
下载: FTP://ftp.psy.uq.oz.au/pub/Crypto/SSL/
文档: http://www.cryptsoft.com/ssleay/doc/
HTTP: http://www.w3.org/Protocols/HTTP/HTTP2.html
http://www.ics.uci.edu/pub/ietf/http/rfc1945.html
http://www.cis.ohio-state.edu/htbin/rfc/rfc2068.html
SNPP: http://www.cis.ohio-state.edu/htbin/rfc/rfc1861.html
其他寻呼协议: http://www.pcia.com/wireres/protocol/links.htm
基于 Web 的寻呼网关列表: http://www.refreq.com/PagingBody.htm