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Posted to users@httpd.apache.org by Qingshan Xie <xi...@yahoo.com> on 2007/06/28 19:23:32 UTC
[users@httpd] Two sessions or one session when connect to two load-balanced webServers?
I have two questions on Sessions and Connections.
1. If a browser sends multiple requests and
establishes Two Connections with an Apache server, how
many sessions it will be generated, one or two?
2. If a browser sends multiple HTTPS requests to two
load-balanced Apache servers, how many sessions will
be generated? I guess it will generate at least two
sessions with two different sessionKeys, sessionIDs.
If this is true, will there be a session conflict
occurring?
Thx, Q.Xie
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Re: [users@httpd] Two sessions or one session when connect to two load-balanced webServers?
Posted by Sander Temme <sc...@apache.org>.
On Jun 28, 2007, at 10:23 AM, Qingshan Xie wrote:
> I have two questions on Sessions and Connections.
>
> 1. If a browser sends multiple requests and
> establishes Two Connections with an Apache server, how
> many sessions it will be generated, one or two?
The answer is None. HTTP is stateless, and Apache does not generate
sessions.
Perhaps your back-end application does preserve state in some way, by
generating session cookies or encoding session information into the URL.
In the latter case, the browser should send the session cookie along
with the second request, or access session-encoded URLs to load
additional resources (images, JavaScript, ...). Such secondary
requests are always based on information obtained from the first
request, even if they appear to occur simultaneously.
Use HTTPWatch or IEWatch to find out what exactly happens when your
browser makes a request, and what cookies get passed back and forth.
> 2. If a browser sends multiple HTTPS requests to two
> load-balanced Apache servers, how many sessions will
> be generated? I guess it will generate at least two
> sessions with two different sessionKeys, sessionIDs.
> If this is true, will there be a session conflict
> occurring?
HTTPS is HTTP piped over SSL. At the HTTP protocol level, the answer
is exactly the same as above.
At the SSL level, an SSL session is generated and likely re-used for
subsequent requests IF you have SSL Session Caching set up
correctly. However, this is completely transparent to the protocol
on top of SSL and has no impact on the state of your application.
To troubleshoot session problems, load up IEWatch or HTTPWatch or
some other protocol inspection tool and look at things like:
1) What cookies get set by the server in the initial response?
2) What path value comes with the session cookie?
3) Does the cookie get passed back to the server by subsequent requests?
4) Does the server respect the cookie from 3), or does it try to set
a new
session cookie?
Once again, this is application level troubleshooting, and has little
to do with Apache itself.
Regards,
Sander
--
Sander Temme
sctemme@apache.org
PGP FP: 51B4 8727 466A 0BC3 69F4 B7B8 B2BE BC40 1529 24AF
Re: [users@httpd] Two sessions or one session when connect to two load-balanced webServers?
Posted by Joshua Slive <jo...@slive.ca>.
On 6/28/07, Qingshan Xie <xi...@yahoo.com> wrote:
> I have two questions on Sessions and Connections.
>
> 1. If a browser sends multiple requests and
> establishes Two Connections with an Apache server, how
> many sessions it will be generated, one or two?
>
> 2. If a browser sends multiple HTTPS requests to two
> load-balanced Apache servers, how many sessions will
> be generated? I guess it will generate at least two
> sessions with two different sessionKeys, sessionIDs.
> If this is true, will there be a session conflict
> occurring?
Wow, you have a real talent for under-defined questions.
To start with, Apache has no notion of sessions. So you need to
identify what software is creating and managing these sessions and
figure out how to answer your questions in the context of this
software.
Joshua.
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