Take a look at mod_backhand

http://www.backhand.org/mod_backhand/

On Mon, Nov 24, 2003 at 10:12:04PM -0800, Ravi Kumar Munnangi wrote:
> Hi developers and users,
> 
>   I have  the following  scenario in my lab now.
>   172.31.19.23 is server with mod_proxy configured.
>    
>   The two actual servers are 172.31.19.24 and 
>   172.31.19.27
>   I have divided the whole web content in two parts, 
>   each on one  actual  server.
> 
>   I have used mod_proxy directives ProxyPass and
> ProxyPassReverse
>  
>   The system is working now.
> 
>   I would like to experiment in two other ways.
> 
>   1. I want the proxy server not to look at the
> request URL but 
>     send the request to actual servers alternatively.
>     If the actual server which gets the request
> doesn't have that data,
>     then it rewrites the request to other actual
> server.
>    
>   2. I want to maintain some  database about the load
> of the proxy
>     server. I will select a threshold value for this
> load. If the 
>     load is below the threshold value, then proxy will
> look at the
>     request and send to the actual servers as per
> directives.
>     Otherwise, it will follow as in first way( sending
> alternatively
>     to the actual servers and then may use rewriting)
> 
> By the second way I think I will be able to reduce the
> load of proxy
> server when it is high.
> 
> Please give me suggestions.
> Also please tell me how I should start to do this.
> 
> Do I  have to modify mod_proxy code and recompile it?
> or  are there any other ways to do this???
> 
> Thankyou.
> 
> waiting for your reply,
> RaviKumar
> 
> 
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