On 13 Nov 2000, 18:23, Mohammed R. Arjomandi wrote:
> Today I visited the http://sagesite.utmb.edu site, but it has moved to
> http://aging.utmb.edu, and there was nothing about free e-mail
> registration in the new site.
Confirmed just now, but you can still sign up for an account at this
page:
http://sagesite.utmb.edu/email/
> In addition to not offering new service, I think their domain is become
> unstable. I got a bounce message when I tried to send to my account in
> sagesite.utmb.edu from Yahoo.
We may lose this account with their changeover.
> I have another simple question too: What is the difference between
> http:// and www? Some sites define themselves as
> http://www.somesites.com but some others as http://someothers.com
> (without www) and finally, some come with www prefix only. Are they
> different in port numbers? I mean, www is always port 80, but http://
> doesn't necessarily require port 80?
HTTP is short for HyperText Transfer Protocol, the set of protocols or
rules utilized by the World Wide Web. That defines how messages are
formatted and transported from computer to computer in the Internet, as
well as how web browsers handle the information.
Let me refer you to this page that explains HTTP in pretty simple terms:
http://www.jmarshall.com/easy/http/
The "www" you refer to is an arbitrary name given to a web server - the
host server that manages the incoming and outgoing HTTP signals. The
name "www" just happens to be what most owners of web servers name
their web server. It is as much by convention than anything else.
In the URL itself, the "www" is a third level domain and the name
server knows by that name where to direct the incoming packets. The
same goes for other third level domains, such as the "someothers" host
name you exampled. There may be more than one web server, or the
software for the web server can manage more than one directory serving
as web servers.
Alan
[EMAIL PROTECTED]
