IMAP4 non-synchronizing literals (RFC2088)
Original Publication Date: 1997-Jan-01
Included in the Prior Art Database: 2019-Feb-16
Internet Society Requests For Comment (RFCs)
The Internet Message Access Protocol [STANDARDS-TRACK]
Network Working Group J. Myers Request for Comments: 2088 Carnegie Mellon Cateogry: Standards Track January 1997
IMAP4 non-synchronizing literals
Status of this Memo
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
The Internet Message Access Protocol [IMAP4] contains the "literal" syntactic construct for communicating strings. When sending a literal from client to server, IMAP4 requires the client to wait for the server to send a command continuation request between sending the octet count and the string data. This document specifies an alternate form of literal which does not require this network round trip.
2. Conventions Used in this Document
In examples, "C:" and "S:" indicate lines sent by the client and server respectively.
The non-synchronizing literal is added an alternate form of literal, and may appear in communication from client to server instead of the IMAP4 form of literal. The IMAP4 form of literal, used in communication from client to server, is referred to as a synchronizing literal.
Non-synchronizing literals may be used with any IMAP4 server implementation which returns "LITERAL+" as one of the supported capabilities to the CAPABILITY command. If the server does not advertise the LITERAL+ capability, the client must use synchronizing literals instead.
The non-synchronizing literal is distinguished from the original synchronizing literal by having a plus (’+’) between the octet count and the closing brace (’}’). The server does not generate a command continuation request in response to a non-synchronizing literal, and
Myers Standards Track [Page 1]
RFC 2088 LITERAL January 1997
clients are not required to wait before sending the octets of a non- synchronizing literal.
The protocol receiver of an IMAP4 server mu...