core/src/main/java/org/nanohttpd/protocols/http/NanoHTTPD.java
@Deprecated
    protected Response serve(IHTTPSession session) {
        return Response.newFixedLengthResponse(Status.NOT_FOUND, NanoHTTPD.MIME_PLAINTEXT, "Not Found");
    }
@Deprecated
    protected Response serve(IHTTPSession session) {
        return Response.newFixedLengthResponse(Status.NOT_FOUND, NanoHTTPD.MIME_PLAINTEXT, "Not Found");
    }
Override this to customize the server.
<p/>
<p/>
(By default, this returns a 404 "Not Found" plain text error response.)

@param session
The HTTP session
@return HTTP response, see class Response for details