The document discusses using a parse template component in Mule to customize HTTP responses. It shows how to create an HTML template file, add it to the Mule project resources, and reference it in a Mule flow to parse the payload and return a customized HTML response. The example flow uses a parse template component after a set payload component to parse an HTML template file that displays the payload within HTML tags. Hitting the HTTP endpoint URL now returns a formatted HTML response instead of a plain text one.