private String getSwaggerSpecFileUrl() {
        return uriFactory.publicUri(
                        ResourcePaths.addUnauthenticatedUiPrefix("swagger", "stroom.json"))
                .toString();
    }
Note: {@link RedirectServlet} will re-direct to here to support legacy servlet paths,
i.e. /stroom/noauth/swagger-ui/xxx
stroom-core/src/main/java/stroom/core/servlet/SwaggerUiServlet.java