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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Make Filter Exception Based on Subnet
Date Wed, 15 Jul 2015 03:27:33 GMT
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Eric,

On 7/14/15 6:24 PM, Eric Robinson wrote:
> Our canned tomcat application's web.xml file contains the following
> filter...
> 
> <filter> <filter-name>SessionFilter</filter-name> 
> <filter-class>servlet.BlahSession</filter-class> </filter>
> 
> <filter-mapping> <filter-name>SessionFilter</filter-name> 
> <url-pattern>/*</url-pattern> </filter-mapping>
> 
> 
> Is there a way to make this filter not apply to requests that 
> originate from certain IP addresses?

You can't configure it out of the Filter chain, but you can certainly
modify the code for SessionFilter to ignore requests from (or, rather,
pass-through requests from) those IP addresses.

Another option would be to change SessionFilter to a pass-through if
some special request attribute is present, and then create another
Filter that sets that request attribute for whatever reason you see
fit. That makes the whole system more flexible because you can add
different Filters for different criteria: if you decide that any
"admin" user should be a pass-through, you can do that with yet
another Filter and leave everything in-place.

- -chris
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