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Date: Fri, 17 Dec 2010 01:24:01 -0500 (EST)
From: "Claus Ibsen (JIRA)" <jira@apache.org>
To: camel-dev@activemq.apache.org
Subject: [jira] Commented: (CAMEL-3429) Extend DSL with more header
 filtering constructs
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    [ https://issues.apache.org/jira/browse/CAMEL-3429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972367#action_12972367 ] 

Claus Ibsen commented on CAMEL-3429:
------------------------------------

To keep backward compatible we could introduce a 2nd parameter for the exceptions

* {{removeHeaders(pattern, exceptionsPattern)}} remove one or more headers based on a pattern, skipping any which has been defined as exceptions. So if you just want to remove all headers, exception foo, then you can do, {{removeHeader(null, "foo")}} or maybe more readable {{removeHeaders("*", "foo")}}

Then in the JAXB model the exceptions is just another attribute, so its compatible
{code:xml}
<removeHeaders pattern="*" exceptions="foo"/>
{code}


> Extend DSL with more header filtering constructs
> ------------------------------------------------
>
>                 Key: CAMEL-3429
>                 URL: https://issues.apache.org/jira/browse/CAMEL-3429
>             Project: Camel
>          Issue Type: Improvement
>          Components: camel-core
>    Affects Versions: 2.5.0
>            Reporter: Richard Kettelerij
>             Fix For: Future
>
>         Attachments: remove-headers-camel-core.patch
>
>
> Currently the DSL offers the following methods:
> - {{removeHeader(name)}} which removes a single header
> - {{removeHeaders(pattern)}} remove one or more headers based on a pattern (since 2.3)
> The attached patch extends the DSL with the following methods:
> - {{removeHeaders(name...)}} removes the headers in the given a vararg parameter. 
> - {{removeHeadersExcept(pattern)}} removes all headers except for the ones matching the given pattern (opposite of {{removeHeaders(pattern)}})
> - {{removeHeadersExcept(name...)}} removes all headers except for the ones in the given vararg parameter (opposite of {{removeHeaders(name)}})
> The rationale for the removeHeadersExcept() method is that in many cases you want to take a _defensive_ approach with regard to header propagation.
> Sometimes you may want to remove _every_ header on the current message, in that case just call removeHeadersExcept() with no arguments.
> In other cases you want to propagate only the "id" header received through the servlet/jetty component (as a query parameter). In that case call
> removeHeadersExcept("id") to preserve the "id" header, while preventing other query parameters (and standard HTTP headers) to flow down your route.

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