New session id with hosts or CNAME entry

I am hoping someone can help me out with a problem I am having with host names and session ids. This may be something simple that I have forgotten about, so here it goes.
Going through the jsp's below give different results, depending on the URL you use.
If you use http://localhost:8080 or http://machine_name:8080
The same session id will be seen on each page.
If you use http://test_01:8080
A different session id is displayed on each page.
What would cause this to happen?
Add the following files under the ROOT webapp of the default Tomcat 4.1.30 installation. Of course, I understand that storing data in servlet context like this is not a good idea, but for testing purposes it will do what is needed.
index.html:
Test_01
<br><br><br>
Call 1
index.jsp:
<html>
<center>
<%= request.getSession().getId() %>
<% application.setAttribute( "session1", request.getSession().getId() ); %>
<h1>Tomcat 1 Call 1</h1>
Call 2
</body>
</html>
index2.jsp:
<html>
<center>
<%= request.getSession().getId() %>
<h1>Tomcat 1 call 2</h1>
Call 3
<br><br>Session 1 ID:
<%= getServletContext().getAttribute( "session1" ) %>
<% application.setAttribute( "session2", request.getSession().getId() ); %>
</body>
</html>
index3.jsp:
<html>
<center>
<%= request.getSession().getId() %>
<h1>Tomcat 1 call 3</h1>
<br><br>Session 1 ID:
<%= getServletContext().getAttribute( "session1" ) %>
<br><br>Session 2 ID:
<%= getServletContext().getAttribute( "session2" ) %>
</body>
</html>
Add the following entry to your host file:
127.0.0.1 test_01
or
<your ip> test_01
or
add a CNAME entry
Thanks for any/all help.

No, it has nothing to do with host names, CNAME, DNS or anything.
The session ID is sent to the server from the browser in either a cookie header or as part of the "extra info" part of a URL with the request. If there is no session ID in either place, the server creates a new session. If there is a session ID, then it gets the session object (if it's not expired). Then it sends the session ID back to the browser with the response to that request (either as a cookie or encoded into the URLs in the page, which you have to do explicitly do for each URL). Click on a link, then the process starts again. The first time you go to a site, you have no session ID. The server just makes a new one.
The only thing that domain names have any affect on is cookies. Cuz cookies are name/value data associated with a domain name of the server (amongst other things). The browser, for security reasons, only sends cookies in requests to servers that set the cookie in the first place. The server can't get cookies that it didn't set.
So if you have a server running on your local machine, you can access that server in 3 ways:
1) localhost
2) network name
3) domain name
The browser can know quite easily that 1 and 2 are the same thing, and send cookies for either interchangably (not that it has to, but it seems you are seeing this happen, so...). But the browser will probably not make any assumption about 3's relation to 1 or 2. The association is generally to domain name, not necessarily IP address.
And it's really a moot point anyway. You should not typically be accessing a server from those 3 different means within the same session. Someone connecting to your server isn't going to use anything but #3 anyway, the other 2 (definitely #1 and #2 only works on the same LAN) wouldn't make much sense. So there's not going to be this issue at all. The session ID itself has no relation whatsoever to a client's domain name.

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No, it has nothing to do with host names, CNAME, DNS or anything.
The session ID is sent to the server from the browser in either a cookie header or as part of the "extra info" part of a URL with the request. If there is no session ID in either place, the server creates a new session. If there is a session ID, then it gets the session object (if it's not expired). Then it sends the session ID back to the browser with the response to that request (either as a cookie or encoded into the URLs in the page, which you have to do explicitly do for each URL). Click on a link, then the process starts again. The first time you go to a site, you have no session ID. The server just makes a new one.
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So if you have a server running on your local machine, you can access that server in 3 ways:
1) localhost
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I am sorry if thie is republished-My first time doing this and I am not sure what goes where and where to hear feedback.
Have published iweb site for five years with no problems and just opened a new site and get -
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It's a really bad idea to post your email address - it's an invitation to spam - and I've asked the Hosts to remove it. (Even though I've now noticed you mis-spelled it! - anyway, never post your address in a forum.)
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REPORT ZSEL_CALL_TCODE.
data : IT_KNA1 TYPE TABLE OF KNA1 WITH HEADER LINE.
DATA : IT_SPA TYPE TABLE OF RFC_SPAGPA WITH HEADER LINE.
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IMPORTING
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