Is there a way to output valid SOAP error messages for things like "Authentication Failed" error?

Issue

• We have tried to put something like the following in the response but are only told that it is invalid:

  <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
     <s:Body>
        <s:Fault xmlns:w="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
           <faultcode>w:InvalidSecurity</faultcode>
           <faultstring/>
        </s:Fault>
     </s:Body>
  </s:Envelope>
  

  I see the field in the webui says the length is 255, and this is over. Even when I make a shorter version though it tells me it is invalid. Can we not put XML in this field? Is there a way we can make this work?

• Is there a way to set HTML error messages in Gateway Response > each error definition > Response Body field?