@Test void setsMaxAgeOnUiResources() throws Exception {
    assertThat(get("/zipkin/config.json").header("Cache-Control"))
      .isEqualTo("max-age=600");
    assertThat(get("/zipkin/index.html").header("Cache-Control"))
      .isEqualTo("max-age=60");
    assertThat(get("/zipkin/test.txt").header("Cache-Control"))
      .isEqualTo("max-age=31536000");
  }
The zipkin-lens is a single-page app. This prevents reloading all resources on each click.
zipkin-server/src/test/java/zipkin2/server/internal/ui/ITZipkinUiConfiguration.java