Hypertext Transfer Protocol -- HTTP/1.1. R. Fielding, J. Gettys, J. Mogul, H. Frystyk, L. Masinter, P. Leach, T. Berners-Lee. June 1999. http://www.faqs.org/rfcs/rfc2616.html
HTTP Authentication: Basic and Digest Access Authentication. J. Franks, P. Hallam-Baker, J. Hostetler, S. Lawrence, P. Leach, A. Luotonen, L. Stewart. June 1999. http://www.faqs.org/rfcs/rfc2617.html
Don't Spew -a Set of Guidelines for Mass Unsolicited Mailings and Postings (Spam*). S. Hambridge, A. Lunde. June 1999. http://www.faqs.org/rfcs/rfc2635.html
Layer Two Tunneling Protocol "L2TP". W. Townsley, A. Valencia, A. Rubens, G. Pall, G. Zorn, B. Palter. August 1999. http://www.faqs.org/rfcs/rfc2661.html