The API uses a simple REST query. If you want to get suggested tags for a piece of content, you simply tack that content to the end of a URL and you'll get an XML document with the suggested tags.

Distinguishing between requests from authenticated and non-authenticated users is possible by relying upon the standard feature of browsers that they include the Authentication HTTP header even for unprotected portions of the site.

Portions of the site that really require authentication will work correctly, because the Authentication header is included. Portions of the site that do not need authentication, can use the name of the authenticated user mentioned in the HTTP authentication header to do personalization.

This page shows how to achieve these effects with all the common browsers and almost pure Apache 2.2

Bad Behavior is a set of PHP scripts which prevents spambots from accessing your site by analyzing their actual HTTP requests and comparing them to profiles from known spambots. It goes far beyond User-Agent and Referer, however. Bad Behavior is available for several PHP-based software packages, and also can be integrated in seconds into any PHP script.

An OpenID identity is just a URL. You can have multiple identities in the same way you can have multiple URLs. All OpenID does is provide a way to prove that you own a URL (identity). And it does this without passing around your password, your email address, or anything you don't want it to. There's no profile exchange component at all: your profiile is your identity URL, but recipients of your identity can then learn more about you from any public, semantically interesting documents linked thereunder (FOAF, RSS, Atom, vCARD, etc.).

Nanoweb is an HTTP server written in PHP, designed to be small, secure, and extensible.

Nanoweb's main features are :

- HTTP/1.1 compliance
- Powerful and easy configuration
- Modular architecture
- FastCGI, CGI and Server side includes support
- Name and port based virtual hosts
- Access control lists
- htpasswd, MySQL, PostgreSQL and LDAP authentication support
- Themes for server generated content
- Apache compatible log format, MySQL logging
- Directory browsing
- inetd support and SSL via external helpers
- Denial of Service protection
- Proxy Server extension
- Filters and gzip support
- RBL support (mail-abuse.org)
- Extension Protocols (request methods) support