Editing Apple Filing Protocol (section)

==History==
Early implementations of AFP server software were available in Mac OS starting with System 6, in AppleShare and AppleShare IP, and in early "1.x" releases of Mac OS X Server. In client operating systems, AFP was called "Personal File Sharing", and supported up to ten simultaneous connections.<ref name="classiclimits">{{cite web|url=http://support.apple.com/kb/TA21611|title=AppleShare & AppleShare IP File Sharing: Chart of All Limitations|access-date=2012-06-10}}</ref> These AFP implementations relied on version 1.x or 2.x of the protocol. AppleShare IP 5.x, 6.x, and the "1.x" releases of Mac OS X Server introduced AFP version 2.2. This was the first version to offer transport connections using TCP/IP as well as AppleTalk. It also increased the maximum share point size from four [[gigabyte]]s to two [[terabyte]]s,<ref name="classiclimits"/> although the maximum file size that could be stored remained at two gigabytes due to limitations in the original Mac OS.<ref>{{cite web|url=http://support.apple.com/kb/TA21924|title=Mac OS 8, 9: Mac OS Extended Format - Volume and File Limits|access-date=2012-06-10}}</ref>

Changes made in AFP since version 3.0 represent major advances in the protocol, introducing features designed specifically for Mac OS X clients. 

However, like the AppleShare client in original Mac OS, the AFP client in Mac OS X continues to support [[type code|type]] and [[creator code]]s, along with [[filename extension]]s.

AFP 3.0 was introduced in [[Mac OS X Server]] 10.0.3, and was used through Mac OS X Server 10.1.5. It was the first version to use the UNIX-style POSIX permissions model and Unicode [[UTF-8]] file name encodings. Version 3.0 supported a maximum share point and file size of two terabytes, the maximum file size and volume size for Mac OS X until version 10.2.<ref name="hfspluslimits">{{cite web|url=http://support.apple.com/kb/HT2422|title=Mac OS X: Mac OS Extended Format - Volume and File Limits|access-date=2012-06-10}}</ref> (Note that the maximum file size changed from version 2.2, described above.) Before AFP 3.0, 31 bytes was the maximum length of a filename sent over AFP.

AFP 3.1 was introduced in Mac OS X Server version 10.2. Notable changes included support for Kerberos authentication, automatic client reconnect, NFS resharing, and secure AFP connections via [[Secure Shell]] (SSH). The maximum share point and file size increased to 8 [[terabytes]] with Mac OS X Server 10.2,<ref name="hfspluslimits"/><ref>{{cite web|url=http://support.apple.com/kb/TA21110|title=Mac OS X Server 10.2: Tested and theoretical maximums (limits)|access-date=2012-06-10}}</ref> and then to 16 terabytes with Mac OS X Server 10.3.<ref name="hfspluslimits"/><ref>{{cite web|url=http://support.apple.com/kb/TA21342|title=Mac OS X Server 10.3: Tested and theoretical maximums (limits)|access-date=2012-06-10}}</ref>

AFP 3.2 adds support for Access Control Lists and [[extended attributes]] in Mac OS X Server 10.4. Maximum share point size is at least 16 terabytes, although Apple has not published a limits document for Mac OS X Server 10.4. Apple implemented AFP 3.2 support in their [[AirPort Time Capsule]] wireless router device.

AFP 3.2+ was introduced in [[Mac OS X Leopard]] and adds case sensitivity support and improves support for [[Time Machine (macOS)|Time Machine]] (synchronization, lock stealing, and sleep notifications).

AFP 3.3 mandates support for Replay Cache functionality (required for [[Time Machine (macOS)|Time Machine]]).

AFP 3.4, introduced in [[OS X Mountain Lion]], includes a minor change in the mapping of POSIX errors to AFP errors.

See Apple's Developer documentation on AFP Version Differences.<ref>{{cite web|url=https://developer.apple.com/library/mac/#documentation/Networking/Conceptual/AFP/AFPVersionDifferences/AFPVersionDifferences.html|title=Apple's Developer documentation on AFP Version Differences|access-date=2011-09-15}}</ref>