I am studying Open source API manager implementation on microservices and I start with WSO2 API Manager 3.1.0 using the available documentation but many solutions mentioned in the document doesn't work.

For example, I checked a forum where people are trying to remove some parts of Response headers especially server: WSO2 Carbon Server. As per documentation it says update <API-M_HOME>/repository/deployment/server/synapse-configs/default/sequences/main.xml and add lines mentioned here https://apim.docs.wso2.com/en/3.1.0/learn/api-gateway/message-mediation/removing-specific-request-headers-from-response/#removing-specific-request-headers-from-response. This did not work for me.

Is this something only available in licensed version or what is the correct process?