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39.4. Installing Filters

Overview
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To install message header filters, set the messageHeaderFilters property of the CxfHeaderFilterStrategy object. When you initialize this property with a list of message header filters, the header filter strategy combines the specified filters to make a filter map.
The messageHeaderFilters property is of type, List<MessageHeaderFilter>.

Installing filters in XML
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The following example shows how to create a CxfHeaderFilterStrategy instance, specifying a customized list of header filters in the messageHeaderFilters property. There are two header filters in this example: SoapMessageHeaderFilter and CustomHeaderFilter. 
<bean id="customMessageFilterStrategy" class="org.apache.camel.component.cxf.common.header.CxfHeaderFilterStrategy">
    <property name="messageHeaderFilters">
        <list>
            <!--  SoapMessageHeaderFilter is the built in filter.  It can be removed by omitting it. -->
            <bean class="org.apache.camel.component.cxf.common.header.SoapMessageHeaderFilter"/>
            
            <!--  Add custom filter here -->
            <bean class="org.apache.camel.component.cxf.soap.headers.CustomHeaderFilter"/>
        </list>
    </property>
    <!-- The 'relayHeaders' property is 'true' by default -->
</bean>
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SoapMessageHeaderFilter
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The first header filter in the preceding example is the SoapMessageHeaderFilter filter, which is the default header filter. This filter is designed to filter standard SOAP headers and is bound to the following XML namespaces: 
http://schemas.xmlsoap.org/soap/
http://schemas.xmlsoap.org/wsdl/soap/
http://schemas.xmlsoap.org/wsdl/soap12/
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This filter peeks at the header element, in order to decide whether or not to block a particular header. If the soap:actor attribute (SOAP 1.1) or the soap:role attribute (SOAP 1.2) is present and has the value next, the header is removed from the message. Otherwise, the header is propagated.

Namespace clashes
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Normally, each namespace should be bound to just a single header filter. If a namespace is bound to more than one header filter, this normally causes an error. It is possible, however, to override this policy by setting the allowFilterNamespaceClash property to true in the CxfHeaderFilterStrategy instance. When this policy is set to true, the nearest to last filter is selected, in the event of a namespace clash.
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