The parameters available to configure the Header mediator are as follows.
|Name||The name of the header element. You can specify the namespace used in the header element by clicking the Namespaces link next to the text field.|
|Action||Select Set if you want to set the header as a new header. Select Remove if you want to remove the header from the incoming message.|
|Value/Expression||A static value or an XPath expression that will be executed on the message to set the header value.|
|Inline XML Header|
This parameter allows you to directly input any XML syntax related to the Header mediator (specifically for SOAP headers). For example, to achieve the following configuration, you should enter the
|Scope||Select Synapse if you want to manipulate SOAP headers. Select Transport if you want to manipulate HTTP headers.|
|Namespaces||You can click this link to|
|add namespaces if you are providing an expression. The Namespace Editor panel would appear. You can enter any number of namespace prefixes and URL that you have used in the XPath expression in this panel.|
You can also configure the Mediator using XML. Click switch to source view in the Mediator window.
In the following example, the value for
P1 code should be included in the SOAP header of the message sent from the client to the EI the ESB profile. To do this, the header mediator is added to the in sequence of the proxy configuration as shown below.
The following example makes the EI add the ESB profile add the HTTP header
Accept with the value
image/jpeg to the HTTP request made to the endpoint.
<in><inSequence> <header name="Accept" value="image/jpeg" scope="transport"/> <send> <endpoint name="people"> <address uri="http://localhost:9763/people/eric+cooke" format="get"/> </endpoint> </send> </in>inSequence> <out><outSequence> <send/> </out>outSequence>
If you have enabled wire logs, you will view the following output.
<< GET /people/eric+cooke HTTP/1.1 << Accept: image/jpeg << Host: localhost:9763 << Connection: Keep-Alive
Example 3 - Handling headers with complex XML