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Exploring WebDAV: Enhancing Collaborative Software Development Through Distributed Authoring

This document delves into the Web-based Distributed Authoring and Versioning (WebDAV) protocol, discussing its features, applications, and performance in collaborative software development. WebDAV extends HTTP to facilitate collaborative file management on remote servers, allowing users to create, modify, and manage resources effectively across different platforms. It covers server and client configurations, locking mechanisms, and performance comparisons against other protocols. While WebDAV offers interoperability and convenience, challenges such as limited HTTPS support and permissions management are also addressed.

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Exploring WebDAV: Enhancing Collaborative Software Development Through Distributed Authoring

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  1. Web-based Distributed Authoring and Versioning Jul 19, 2005 Shin Young Ahn Web-based Software Development

  2. Table of Contents • Introduction • WebDAV • WebDAV Server/Client • Apache2.0 install • Client snapshots • Performance Experiment • Summary Web-based Software Development

  3. Introduction The Net Working together on the same document, wherever you are and whatever you use Web-based Software Development

  4. The World is a Folder • Motto : • Metadata repository infrastructure • A Web-based network file system • A replacement protocol that can handle email, calendaring, directory lookup and more What is WebDAV? • Web-based Distributed Authoring and Versioning. • A set of extensions to the HTTP protocol • allows users to collaboratively edit and manage files on remote web servers. Web-based Software Development

  5. WebDAV - Collections • “Namespace” refers to the URL hierarchy • Collection (“file system folder”) • A collection of resources • A collection is also a resource • Member resource • “Leaves” in the namespace • Applies to all kinds of content • not just HTML and images • WebDAV provides operations to create, move, copy, and delete resources Web-based Software Development

  6. WebDAV - Properties • Properties are pairs of name and value • All resources have properties • Server-defined & maintained • Creation date • Size • Last Modified • Client-defined • Author • Title • WebDAV provides operations to create, remove and query properties Web-based Software Development

  7. WebDAV - Locking • Prevents the “lost update” problem • Identified by authentication and lock token • Locks have characteristics such as • Timeout • Owners • Depth • Resources may be locked as • Exclusive • Shared Web-based Software Development

  8. WebDAV Standards DeltaV (RFC 3253) VERSION-CONTROL, REPORT, CHECKIN, CHECKOUT, UNCHECKOUT, MKWORKSPACE, LABEL, UPDATE, MERGE, MKACTIVITY, BASELINE-CONTROL DASL (DAV Searching & Locating) SEARCH ACL(RFC3744) (Access Control) ACL WebDAV (RFC 2518) (Distributed Authoring Protocol) PROPFIND, PROPPATCH, LOCK, UNLOCK, MKCOL, COPY, MOVE HTTP (HyperText Transfer Protocol) GET, HEAD, POST, OPTIONS, PUT, DELETE, TRACE Web-based Software Development

  9. WebDAV – HTTP extensions • HTTP • Options • Get • Post • Put • Head • Delete • Trace • Connect • WebDAV (additional methods) • PropFind • PropPatch • MkCol • Delete • Put • Copy, Move • Lock, Unlock • Body == XML Web-based Software Development

  10. WebDAV Servers • Apache 2.0 • Subversion • Slide • Tamino WebDAV Server • Oracle Internet File System • Microsoft • Internet Information Server • Exchange Server • Sharepoint Portal Server • Xythos WebFile Server Web-based Software Development

  11. WebDAV Clients • XML Spy • XMetal • Microsoft • Office • Windows Explorer • Adobe • GoLive • Photoshop • Macromedia Dreamweaver • WebDrive • WebDAVfs • sunDance • DAVExplorer Web-based Software Development

  12. Apache2.0 configuration • Httpd.conf • LoadModule dav_module modules/mod_dav.so • LoadModule dav_fs_module modules/mod_dav_fs.so • DavLockDB var/DavLock • Alias /myhome var/DavRoot • <Location /myhome> • Dav On • </Location> Web-based Software Development

  13. Run apache server Web-based Software Development

  14. DAVExplorer Web-based Software Development

  15. MS File Explorer Web-based Software Development

  16. XML Spy Web-based Software Development

  17. Performance? • HW environment • Local Network • P3 750Mhz 256mb client & server • Data : 100MB( 3 folders and 41 files) • Experiment • Copy using WebDAV(Apache 2.0) • Copy using NFS of Linux system • Copy using FTP Client Web-based Software Development

  18. Performance comparison Web-based Software Development

  19. Summary • Use of WebDAV as interoperable network filesystem • Can be applied to collaborative tools as well (Exchange) • Takes advantage of HTTP and XML ubiquity • Excellent level of interoperability for file access • Really reachable from any device / anywhere • Very simple to implement • But... • Still few implementation glitches • https support is still limited • Not a high-performance file system • Not a replacement for native file system (eg NTFS) • Permission management still require custom implementations Web-based Software Development

  20. Reference • RFCs • RFC 2518: http://www.ietf.org/rfc/rfc2518.txt • RFC 2445: http://www.faqs.org/rfcs/rfc2445.html • RFC 3744: http://www.faqs.org/rfcs/rfc3744.html • WebDAV Resources • http://www.webdav.org/ • Apache2 install • http://httpd.apache.org/docs-2.0/mod/mod_dav.html#example • http://www.apache-kr.org/ Web-based Software Development

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