How to implement virtual hosts

Hi all,
I have developed my own application server in java using RMI.
I would like to implement a mechanism to allow the definition of virtual hosts as other products such as Resin or JBoss do, but I cannot find where to look for some example...
Has anybody an idea abut this?
Thanks in advance

Implimentation is up to you what you have to find out is how the clinet-server interface identifies the which Virtual Host to use.
I think that you should read Protocole specifications for that

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    Following is a note explaining how to setup
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    Ranga
    Note:70647.1
    Subject: Apache Server Virtual Hosting
    Last Revision Date: 07-JUN-2001
    PURPOSE
    This document discusses considerations for setting up virtual hosts on an
    Apache machine, to include how to get the hostname working and how to
    configure Apache.
    SCOPE & APPLICATION
    The information in this document is intended for those who manage multiple sites
    using an Apache machine.
    REFERENCES
    First published in Apache Week issue 31 (6th September 1996)
    Last update 20th September 1998
    Using Virtual Hosts
    Virtual Hosts let you run multiple independent Web sites on a single host with
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    One of the most important facilities in Apache is its ability to run virtual
    hosts. This is now the essential way to run multiple Web services - each with
    different host names and URLs - that appear to be completely separate sites.
    This is widely used by ISPs, hosting sites and content providers who need to
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    There are two types of virtual hosts: IP-based and non-IP-based. The former is
    where each virtual host has its own IP address. You must have a new IP address
    for each virtual host you want to set up, either from your existing allocation
    or by obtaining more from your service provider. When you have extra IP
    addresses, you tell your machine to handle them. On some operating systems, you
    can give a single ethernet interface multiple addresses (typically with an
    fconfig alias command). On other systems, you must have a different
    physical interface for each IP address (typically by buying extra ethernet
    cards).
    IP addresses are a resource that costs money and are increasingly difficult to
    get, so modern browsers can now also use 'non-IP' virtual hosts. This
    lets you use the same IP address for multiple host names. When the server
    receives an incoming Web connection, it does not know the hostname that was used
    in the URL. However, the new HTTP/1.1 specification adds a facility where the
    browser must tell the server the hostname it is using, on the Host: header. If
    an older browser connects to a non-IP virtual host, it does not send the Host:
    header, so the server must respond with a list of possible virtual
    hosts. Apache provides some help for configuring a site for both old and new
    browsers.
    Picking a Hostname and Updating the DNS
    Having selected an IP address, the next stage is to update the DNS so that
    browsers can convert the hostname into the right address. The DNS is the system
    that every machine connected to the internet uses to find the IP address of host
    names. If your hostname is not in the DNS, no one can connect to
    your server (except by the unfriendly IP address).
    If the virtual hostname you are going to use is under your existing domain,
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    is in someone else's domain, you must get them to add it to their DNS
    server files. In some cases, you want to use a domain not yet used on the
    internet, in which case you must apply for the domain name from the
    InterNIC and set up the primary and secondary DNS servers for it, before adding
    the entry for your virtual host.
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    (an A record) pointing to the appropriate IP address. For example, say you want
    the domain www.my-dom.com to access your host with IP address 10.1.2.3: you
    must add the following line to the DNS zone file for my-dom.com:
    www A 10.1.2.3
    Now, users can enter http://www.my-dom.com/ as a URL in their browsers and get
    to your Web server. However, it will return the same information as if the
    machine's original hostname had been used. So, the final stage is to tell Apache
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    How Apache Handles Virtual Hosts
    Configuring Apache for virtual hosts is a two-stage process. First, it needs
    to be told which IP addresses (and ports) to listen to for incoming Web
    connections. By default, Apache listens to port 80 on all IP addresses of the
    local machine, and this is often sufficient. If you have a more complex
    requirement, such as listening on various port numbers, or only to specific IP
    addresses, then the BindAddress or Listen directives can be used.
    Second, having accepted an incoming Web connection, the server must be
    configured to handle the request differently, depending on what virtual host it
    was addressed to. This usually involves configuring Apache to use a different
    DocumentRoot.
    Telling Apache Which Addresses to Listen To
    If you are happy for Apache to listen to all local IP addresses on the port
    specified by the Port directive, you can skip this section. However, there are
    some cases where you want to use the directives explained here:
    - If you have many IP addresses on the machine but only want to run a Web
    server on some of them
    - If one or more of your virtual hosts is on a different port
    - If you want to run multiple copies of the Apache server serving different virtual
    hosts
    There are two ways of telling Apache what addresses and ports to listen to:
    - Use the BindAddress directive to specify a single address or port
    - Use the Listen directive to any number of specific addresses or ports
    For example, if you run your main server on IP address 10.1.2.3 port 80, and a
    virtual host on IP 10.1.2.4 port 8000, you would use:
    Listen 10.1.2.3:80
    Listen 10.1.2.4:8000
    Listen and BindAddress are documented on the Apache site.
    Configuring the Virtual Hosts
    Having gotten Apache to listen to the appropriate IP addresses and ports, the
    final stage is to configure the server to behave differently for requests on
    each of the different addresses. This is done using <VirtualHost> sections in
    the configuration files, normally in httpd.conf.
    A typical (but minimal) virtual host configuration looks like this:
    <VirtualHost 10.1.2.3>
    DocumentRoot /www/vhost1
    ServerName www.my-dom.com
    </VirtualHost>
    This should be placed in the httpd.conf file. You replace the text
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    port as well, follow the IP address with a colon and the port number
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    setting up virtual hosts, we call the default behavior the main server
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    hosts, you must decide what changes to make in each of the virtual
    host configurations.
    Any directives inside a <VirtualHost> section apply to just that virtual host.
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    Now, when a request arrives, Apache uses the IP address and port it arrived on
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    address and port, it is handled by the main server configuration. If it does
    match a virtual host address, Apache uses the configuration of that virtual
    server to handle the request.
    For the example above, the server configuration used is the same as the
    main server, except that the DocumentRoot is /www/vhost1, and the
    ServerName is www.my-dom.com. Directives commonly set in <VirtualHost>
    sections are DocumentRoot, ServerName, ErrorLog and TransferLog. Directives
    that deal with handling requests and resources are valid inside <VirtualHost>
    sections. However, some directives are not valid inside <VirtualHost> sections,
    including BindAddress, StartSevers, Listen, Group and User.
    You can have as many <VirtualHost> sections as you want. You can
    leave one or more of your virtual hosts being handled by the main server, or
    have a <VirtualHost> for every available address and port, and leave the main
    server with no requests to handle.
    VirtualHost sections for non-IP Virtual Hosts
    Non-IP virtual hosts are configured in a very similar way. The IP address that
    the requests arrive on is given in the <VirtualHost> directive, and the
    host name is put in the ServerName directive. The difference is that there
    (usually) is more than one <VirtualHost> section handling the same IP address.
    For Apache to know whether a request arriving on a particular IP
    address is supposed to be a name-based requests, the NameVirtualHost directive
    addresses for name-based requests. A virtual host can handle more than one
    non-IP hostname by using the ServerAlias directive, in addition to the
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    null

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    Di Li

    Hi Srikishan,
    thanks for your reply. Your suggested way is certainly a potential, and also my preferred option for solving the multiple-client-capable URL access to WebDynpro / BSP applications.
    However, for some reasons, based on the customer requirements, the client should not be visible in the URL. The URL for accessing the WebDynpro / BSP applications on different client should have different host name, as if they are different companies. Besides that, we want to manage each WebDynpro / BSP application on different clients in SICF separately.
    Therefore, at least on my opinion, we need to introduce a virtual host for each client in SICF. But how do I make it happen?
    Regards
    Di

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