Re: Webserver Redundacy

[Andrew Miehs <andrew@2sheds.de>]

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On 28/02/2007, at 8:05 AM, Jim Popovitch wrote:

> > And seeing how wonderful browsers (and resolver libraries) are, they
> > have probably cached the IP address - and you will need to restart  
> > your
> > browser to try to get to the second and working web server.
>
> Actually most browsers (and certainly most resolver libs) cache as  
> many
> IPs as are returned by the query.  So, the browser will have the  
> list of
> IPs necessary to reach the website, and if one doesn't work it will  
> try
> the next one.

Which browsers are those that work in this way?!

If this is the case, then you may also have a session persistence  
problem.
If the browser switches IP addresses between queries, the other web  
server
may be asked to respond, in which case, you will not be able to store  
state
in the web server, and will need to store it in the backend - and  
this between
requests - not visits.

Andrew
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