Phys - For Old Browsers
The right column of URLs marked "Phys" is for users of old
browsers that do not support virtual name domains, & only
support physical domain names.
Virtual Domains
httpd.apache.org/
docs/ vhosts/ name-based.html says:
Some ancient clients are not compatible with name-based
virtual hosting. For name-based virtual hosting to work,
the client must send the HTTP Host header. This is required
by HTTP/1.1, and is implemented by all modern HTTP/1.0
browsers as an extension.
Browsers I've checked all emit HTTP/1.0 requests & fetch
virtual domains:
- Lynx: Apache reporting it as: "Lynx/2.8.4rel.1
libwww-FM/2.14"
- Mozilla: Apache reporting it as: "Mozilla/5.0 (X11; U;
FreeBSD i386; en-US; rv:0.9.7) Gecko/20020527"
- Netscape: Apache reporting it as: "Mozilla/3.04 (X11;
I; FreeBSD 4.5-RELEASE i386)"
- Opera: Apache reporting it as: "Mozilla/4.0
(compatible; MSIE 5.0; Linux 2.4.2 i386) Opera 6.0
[en]"
Www or Not
Variations on names are possible: EG
http://berklix.com works as well as
http://www.berklix.com
but with "www" gets the official default server, whereas
without WWW you just get whichever server answers first.
Without the "www", some domains go to a possibly older copy
of the domain front page, that is guaranteed available on all
servers (whereas the www. front page may be updated by the
owner on just the prime www server).
Www, Www1, Www2 Www3 Www4 etc
Variations on names are possible: www is the default web
server, which is usually the same as www1, www may be
switched to www2 www3 or www4 during upgrades etc. (Ditto for
mx, mx1, mx2, mx3 mx4 & ftp, ftp1, ftp2, ftp3 ftp4 ).
