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https://issues.apache.org/jira/browse/SOLR-632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12614656#action_12614656
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Norberto Meijome commented on SOLR-632:
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LK>Jetty explicitely removes all headers related to caching (except pragma) 
when calling sendError() from SVN version 1917. I think that 
LK> removing the headers is a sensible thing to do, as they could instruct a 
cache to store the error message.

+1

LK> I've filed a Jetty issue to set the Cache-Control header to explicitely 
prohibit caching (https://jira.codehaus.org/browse/JETTY-646). If we want 
LK> to get the new Jetty version in with the 1.3 release then it's probably 
best to change the failing unit test to verify that at least no header 
LK> instructing any caches to store the reply is set.

makes sense to me.

LK> OTOH, having Jetty change the headers on its own is probably going to 
require some 
LK> changes to the HTTP caching code.

Is cache-control compulsory? if not, Jetty isnt' really breaking anything by 
not including it, and not really that high priority for Jetty -  although 
having cache-control prohibiting cache would be a more proper approach.

> Upgrade bundled Jetty with latest from vendor
> ---------------------------------------------
>
>                 Key: SOLR-632
>                 URL: https://issues.apache.org/jira/browse/SOLR-632
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 1.3
>            Reporter: Norberto Meijome
>            Assignee: Erik Hatcher
>            Priority: Minor
>             Fix For: 1.3
>
>   Original Estimate: 0.25h
>  Remaining Estimate: 0.25h
>
> The Jetty that is bundled for the example application is version 6.1.3, which 
> is over a year old.
> We should upgrade Jetty to the latest, 6.1.11.
> I am not sure how to attach a patch to remove files, so these are the steps :
> Using as base the root of 'apache-solr-nightly':
> DELETE:
> example/lib/jetty-6.1.3.jar
> example/lib/jetty-util-6.1.3.jar
> example/lib/servlet-api-2.5-6.1.3.jar
> ADD
> example/lib/jetty-6.1.11.jar
> example/lib/jetty-util-6.1.11.jar
> example/lib/servlet-api-2.5-6.1.11.jar
> ---
> The files to be added can be found in Jetty's binary distribution file :
> http://dist.codehaus.org/jetty/jetty-6.1.11/jetty-6.1.11.zip
> I couldn't find any noticeable changes in jetty.xml that should be carried 
> over.

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