Stops processing the request and sends a response back to the client without calling the backend. If the exchange already holds a response, that response is sent; otherwise a new response is built from the request's body and Content-Type. Often paired with template to return a generated body. See the examples under examples/templating.
Content-Type of the response. When unset, an existing response's Content-Type is left unchanged; only when a new response is built from the request is the request's Content-Type used if present, otherwise none is set.