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The mod_negotiation Apache Module
The Apache Web Server has the ability to look at the language preference specified by a web browser client (such as Netscape Navigator or Microsoft Internet Explorer) and return the content of different files depending on that preference. This ability, termed Content Negotiation, is a simple yet very powerful Apache feature.

Installation
Connect to your Virtual Server via Telnet or SSH and add the following line to the top of your web server configuration file (~/www/conf/httpd.conf) to dynamically load the mod_negotiation Apache Module.

LoadModule  negotiation_module  modules/mod_negotiation.so

Configuration
Make the following additions and modifications to your Virtual Server web server configuration file (~/www/conf/httpd.conf).

  1. Add language directive using the AddLanguage directive, like this:

    AddLanguage en .en
    AddLanguage es .es
    AddLanguage fr .fr
    AddLanguage de .de
    AddLanguage it .it
    AddLanguage jp .jp
    

    The AddLanguage directive associates file extensions (.en .es .fr .de .it .jp) with corresponding language abbreviations (en es fr de it jp). The abbreviations are predefined and can be located in any of the latest generation web browser clients.

    • Netscape Navigator
      Edit->Preferences->Navigator->Languages->Add(button)

    • Microsoft Internet Explorer
      Tools->Internet Options->General(tab)->Languages(button)->Add(button)

  2. Add a language priority directive using the LanguagePriority directive, like this:

    LanguagePriority en es fr de
    

    The LanguagePriority directive allows you to give precedence to some languages in case of a "tie" during content negotiation or if the browser client does not specify a language priority (older web browsers). Just list the languages in decreasing order of preference.

  3. Add the MultiViews option to the Options directive that is part of your <Directory /usr/local/etc/httpd/htdocs> definition. For example, your web server configuration file probably is set up this way currently:

    <Directory /usr/local/etc/httpd/htdocs>
    
    # This may also be "None", "All", or any combination of "Indexes",
    # "Includes", "FollowSymLinks", "ExecCGI", or "MultiViews".
    
    # Note that "MultiViews" must be named *explicitly* --- "Options All"
    # doesn't give it to you (or at least, not yet).
    
    Options Indexes FollowSymLinks
    

    Add the MultiViews option like this:

    Options Indexes FollowSymLinks MultiViews
    

    The MultiViews option can also be added to the Options definition in .htaccess files.

Serving Language-Specific Content
That's it! Create and upload language-specific content to your Virtual Server using the appropriate extensions. For example, create index.html.en, index.html.es, and index.html.fr files in addition to an index.html file. When a web browser client requests index.html, the web server will analyze the language preference of the web browser client and serve the appropriate index.html.* file seamlessly and transparently.

NOTE: If the language preference submitted by the web browser does not match any of the type definitions configured in your web server and documents you have authored, then the web server will return a "406" error (i.e. the resource was found, but could not be delivered because the type of the resource is incompatible with the acceptable types indicated by the accept or accept-encoding headers sent to the web server by the web browser client). For example, if a client will only accept Greek content (el) and nothing else, and you have only authored content in English, Spanish, and German, then the web browser client will report a "406" error. It may be wise to capture "406" errors with a custom ErrorDocument script.

More Information
See the following.


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