Undertow filter to set request header like mod_headers?

Question

My live server is using mod_headers to set a value with a syntax like -

Header set MY_FILE "MY_VALUE"

Is there an undertow filter to set a value in a request header prior to passing to my application?

<subsystem>
   <filters>
      <response-header name="server-header" header-name="Server" header-value="WildFly/8"/>
      <response-header name="x-powered-by-header" header-name="X-Powered-By" header-value="Undertow/1"/>
   </filters>
</subsystem>

The reason for my question is that I am needing to connect automate my selenium tests on Jenkins, and cant set the value without changing the configuration of my application. My Jenkins environment is not fronted with Apache

Answer 1

Use the expression-filter filter.

<host name="default-host" alias="localhost">
    ...
    <filter-ref name="set-custom-header"/>
    ...
    ...
</host>


<filters>
    ...
    ...
    <expression-filter name="set-custom-header" expression="set(attribute='%{i,MY_FILE}', value='MY_VALUE')"/>
</filters>

documentation:

http://undertow.io/undertow-docs/undertow-docs-1.3.0/predicates-attributes-handlers.html

The attribute %{i,request_header_name} defines request attribute.