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The following RFC documents are related to LFTP:

• RFC854 - TELNET protocol, also used as underlying protocol for FTP.
• RFC959 - FTP protocol.
• RFC1123 - Requirements for Internet Hosts -- Application and Support. In particular it states that programs should try all IP addresses of multihomed hosts. lftp-2.0.0 and later does so.
• RFC1738 - URL syntax specification (FTP /%2F too).
• RFC1945 - HTTP/1.0 protocol.
• RFC2052 - SRV DNS records. lftp-2.0.2 and later optionally support it.
• RFC2228 - FTP Security Extensions.
• RFC2389 - Feature negotiation mechanism for the File Transfer Protocol. It is implemented in lftp-3.0.0.
• RFC2428 - FTP over IPv6. lftp-2.0.0 and later support it.
• RFC2616 - HTTP/1.1 protocol.
• RFC2617 - HTTP Authentication: Basic and Digest Access Authentication. Digest authentication is implemented in lftp-4.7.0.
• RFC2640 - Internationalization of the File Transfer Protocol. It is implemented in lftp-3.0.0.
• RFC3659 - Extensions to FTP.
• RFC4217 - Securing FTP with TLS.

Related drafts:

• Deflate transmission mode for FTP
• SSH File Transfer Protocol

BitTorrent related documents:

• The BitTorrent Protocol Specification
• BitTorrent protocol specification
• BitTorrent multitracker specification
• BitTorrent IPv6 tracker extension
• DHT Protocol
• Fast Extension
• IPv6 Tracker Extension
• Extension for Peers to Send Metadata Files
• Extension Protocol
• Multitracker Metadata Extension
• Tracker Returns Compact Peer Lists
• DHT Extensions for IPv6
• DHT security extension
• UDP tracker