如何获取RFC文档
2. ftp://ftp.rfc-editor.org/ RFCs can be obtained via FTP fromFTP.RFC-EDITOR.ORG, with the pathname in-notes/rfcnnnn.txt (where"nnnn" refers to the number of the RFC). Login with FTP username"anonymous" and password "name@host.domain".
4. 中文RFC参考文档:http://www.cnpaf.net/class/RfcAll/