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<P>We've moved the old stuff and now you'll find it at:</P>
<A HREF="http://gnulix.org/newstuff/">New stuff</A>!.
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mod_authmod_auth uses a simple user authentication scheme, referred to as Basic Authentication, which is based on storing usernames and encrypted passwords in a text file. This file looks very much like Unix's /etc/passwd file and is created with the htpasswd command. Refer to the "File System Authentication and Access Control" section earlier in this chapter for more information about this subject.
mod_auth_anonThe mod_auth_anon module provides anonymous authentication similar to that of anonymous FTP. The module enables you to define user IDs of those who are to be handled as guest users. When such a user tries to log on, he is prompted to enter his email address as his password. You can have Apache check the password to ensure that it's a (more or less) proper email address. Basically, it ensures that the password contains an @ character and at least one . character.
mod_auth_dbmmod_auth_dbm uses Berkeley DB files instead of text for user authentication files.
mod_auth_digestmod_auth_digest builds upon the mod_auth module, and sends authentication data via the MD5 Digest Authentication process as defined in RFC 2617. Compared to using Basic Authentication, this is a much more secure way of sending user data over the Internet. Unfortunately, not all web browsers support this authentication scheme.
To create password files for use with mod_auth_dbm, you must use the htdigest utility. It has more or less the same functionality as the htpasswd utility. See the man page of htdigest for further information.
mod_autoindexThe mod_autoindex module dynamically creates a file list for directory indexing. The list is rendered in a user-friendly manner similar to those lists provided by FTP's built-in ls command.
mod_cgimod_cgi allows execution of CGI programs on your server. CGI programs are executable files residing in the /var/www/cgi-bin directory and are used to dynamically generate data (usually HTML) for the remote browser when requested.
mod_dir and mod_envThe mod_dir module is used to determine which files are returned automatically when a user tries to access a directory. The default is index.html. If you have users who create web pages on Windows systems, you should also include index.htm, like this:
DirectoryIndex index.html index.htm
mod_env controls how environment variables are passed to CGI and SSI scripts.
mod_expiresmod_expires is used to add an expiration date to content on your site by adding an Expires header to the HTTP response. Web browsers or cache servers don't cache expired content.
mod_headersmod_headers is used to manipulate the HTTP headers of your server's responses. You can replace, add, merge, or delete headers as you see fit. The module supplies a Header directive for this. Ordering of the Header directive is important. A set followed by an unset for the same HTTP header removes the header altogether. You can place Header directives almost anywhere within your configuration files. These directives are processed in the following order:
1. Core server
2. Virtual host
3. <Directory> and .htaccess files
4. <Location>
5. <Files>
mod_info and mod_log_configmod_info provides comprehensive information about your server's configuration. For example, it displays all the installed modules, as well as all the directives used in its configuration files.
mod_log_config defines how your log files should look. See the "Logging" section for further information about this subject.
mod_mime and mod_mime_magicThe mod_mime module tries to determine the MIME type of files from their extensions.
The mod_mime_magic module tries to determine the MIME type of files by examining portions of their content.
mod_negotiationUsing the mod_negotiation module, you can select one of several document versions that best suits the client's capabilities. You can select from among several options for which criteria to use in the negotiation process. You can, for example, choose among different languages, graphics file formats, and compression methods.
mod_proxymod_proxy implements proxy and caching capabilities for an Apache server. It can proxy and cache FTP, CONNECT, HTTP/0.9, and HTTP/1.0 requests. This isn't an ideal solution for sites that have a large number of users and therefore have high proxy and cache requirements. However, it's more than adequate for a small number of users.
mod_rewritemod_rewrite is the Swiss army knife of URL manipulation. It enables you to use powerful regular expressions to perform any imaginable manipulation of URLs. It provides rewrites, redirection, proxying, and so on. There's very little that you can't accomplish with this module.
See http://localhost/manual/misc/rewriteguide.html for a cookbook that gives you an in-depth explanation of what the mod_rewrite module is capable of.
mod_setenvifmod_setenvif allows manipulation of environment variables. Using small snippets of text-matching code known as regular expressions, you can conditionally change the content of environment variables. The order in which SetEnvIf directives appear in the configuration files is important. Each SetEnvIf directive can reset an earlier SetEnvIf directive when used on the same environment variable. Be sure to keep that in mind when using the directives from this module.
mod_spelingmod_speling is used to enable correction of minor typos in URLs. If no file matches the requested URL, this module builds a list of the files in the requested directory and extracts those files that are the closest matches. It tries to correct only one spelling mistake.
mod_statusYou can use mod_status to create a web page containing a plethora of information about a running Apache server. The page contains information about the internal status as well as statistics about the running Apache processes. This can be a great aid when you're trying to configure your server for maximum performance. It's also a good place to see whether something's amiss with your Apache server.
mod_ssl