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Question on filter chaining
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Avlesh Singh  
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 More options Jun 10, 5:37 am
From: Avlesh Singh <avl...@gmail.com>
Date: Wed, 10 Jun 2009 15:07:57 +0530
Local: Wed, Jun 10 2009 5:37 am
Subject: Question on filter chaining
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I have a bunch of filters configured in my webapp, the UrlRewrite filter
being the first one in the chain.
I noticed a strange behavior, url's that were rewritten bypassed all the
subsequent filters. On looking into the UrlRewriteFilter source, I spotted
this code

if (!requestRewritten) {

>   chain.doFilter(hsRequest, urlRewriteWrappedResponse);
> }

I am trying to understand what does this mean. Should UrlRewrite be the last
filter in the chain? If yes, why? As in, why should all other filters be
skipped when the url is rewritten?

Cheers
Avlesh


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Wim De Smet  
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 More options Jun 11, 3:57 am
From: Wim De Smet <krom...@gmail.com>
Date: Thu, 11 Jun 2009 09:57:15 +0200
Local: Thurs, Jun 11 2009 3:57 am
Subject: Re: Question on filter chaining
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Hi,

On Wed, Jun 10, 2009 at 11:37 AM, Avlesh Singh<avl...@gmail.com> wrote:
> I have a bunch of filters configured in my webapp, the UrlRewrite filter
> being the first one in the chain.
> I noticed a strange behavior, url's that were rewritten bypassed all the
> subsequent filters. On looking into the UrlRewriteFilter source, I spotted
> this code

>> if (!requestRewritten) {
>>   chain.doFilter(hsRequest, urlRewriteWrappedResponse);
>> }

> I am trying to understand what does this mean. Should UrlRewrite be the last
> filter in the chain? If yes, why? As in, why should all other filters be
> skipped when the url is rewritten?

I'm not sure about the why (I assume re-parsing request parameters
etc) but rewritten urls get FORWARD'ed. This is why you'll have to
make other filters listen on FORWARD if you want them to get hit after
rewriting.

regards,
Wim


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