WebDav is a HTTP extension which allows users to put files, create directories, just like you would do using a FTP server. Its major advantages on FTP are that it uses a unique TCP inbound communication channel and passes though web standard ports (it's still HTTP !), reducing problems for accessing from firewalled networks, and takes profit from web servers in general, such as authentication and the use of HTTPS secured communication channels.

A simple WebDav application is for instance the SyncPlaces Firefox extension, allowing you to share your bookmarks among different computers, using the WebDav server for storing the bookmarks files.

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