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References: <56FC17DC.6040407@gmail.com>
 <56FC1FED.1070308@christopherschultz.net> <56FC22B2.5080907@gmail.com>
From: Christopher Schultz <chris@christopherschultz.net>
Message-id: <56FC2E16.6070707@christopherschultz.net>
Date: Wed, 30 Mar 2016 15:50:46 -0400
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Subject: Re: [users@httpd] Load balancing based on header value

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Niranjan,

On 3/30/16 3:02 PM, Niranjan Rao wrote:
> I am using AJP to connect to tomcat.
> 
> Entry in the config file looks like
> 
> <Proxy balancer://cluster> BalancerMember ajp://myserver:8009
> route=node2 ProxySet lbmethod=bytraffic ProxySet
> stickysession=JSESSIONID </Proxy>
> 
> Hope this answers your question.

Okay, so you are using mod_proxy_ajp.

I'm not sure how to do it in mod_proxy_ajp, but mod_jk allows the
request to override the worker to be used. I believe if you set the
JK_WORKER_NAME environment variable (for mod_jk only) that worker name
will be used. You can use whatever means in httpd to set that variable
such as mod_rewrite, etc.

I would imagine that there is a similar facility in mod_proxy_ajp.

- -chris

> On 3/30/16 2:15 PM, Niranjan Rao wrote:
>>>> Greetings,
>>>> 
>>>> My first post to this mailing list.
>>>> 
>>>> I have apache2 load balancing working perfectly based on
>>>> session affinity. Traffic does get directed properly to
>>>> appropriate tomcat server.
>>>> 
>>>> We are trying to use same servers to serve some REST API
>>>> calls. These calls don't have a session, however tomcat
>>>> honouring the request does maintain some state and we would
>>>> like to redirect the traffic to same tomcat based on some
>>>> header value.
>>>> 
>>>> Tried searching and reading documents from apache web site,
>>>> but have not figured it out yet.
>>>> 
>>>> Can I load balance based on header value? It seems to be
>>>> doable, but could not find any example or how-to.
> Which module are you using to proxy httpd -> Tomcat?
> 
> -chris
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