Protocol Utility Modules
The protocol modules themselves can be registered dynamically (using
static binding) but some of the functionality used by the modules are
kept in a set of protocol utility modules that are described in this
section.
Access Authorization
In order to prevent unauthorized access on a Web server, a basic
authorization scheme has been developed, see Access
Authorization for more details on the scheme. The access
authorization is implemented in the following modules:
- HTAABrow
- This module contains WWW Browser specific code, that is composing
the HTTP Authorization Header, recording users information etc.
- HTAAUtil
- This module contains the authorization code that is common to both the
servers and clients, e.g., handling information on different authentication
etc.
- UU Encoding and Decoding
- Provides functions to encode and decode a data buffer according to
the RFC
1421 "Privacy Enhancement for Internet Electronic Mail".
Presenting Directory Listings and other Listings
When listings return from the protocol modules they are converted into HTML
and parsed to the client. Listings might be HTTP directory listings, Gopher
menus, FTP directory listings, CSO Name server etc. The modules providing this
functionality are:
- HTDir
- This is a very configurable module to actually present the listings
- HTDescript
- This module handles the description field in a HTTP directory listing.
For a HTML file, the default action is to peek the title of the document.
- HTIcons
- This module handles the set of icons used in the listings (HTTP, Gopher,
FTP etc.).
Logging Requests
The HTLog Module is a
simple log manager that can log the result of a request to the access
manager.
Henrik Frystyk, libwww@w3.org,
@(#) $Id: ProtocolUtils.html,v 1.14 1996/12/09 03:21:46 jigsaw Exp $