code: @Test public void varyFieldsAreCaseInsensitive() throws Exception {
    server.enqueue(new MockResponse().addHeader("Cache-Control: max-age=60").addHeader("Vary: ACCEPT-LANGUAGE").setBody("A"));
    server.enqueue(new MockResponse().setBody("B"));
    server.play();
    URL url=server.getUrl("/");
    URLConnection connection1=openConnection(url);
    connection1.addRequestProperty("Accept-Language","fr-CA");
    assertEquals("A",readAscii(connection1));
    URLConnection connection2=openConnection(url);
    connection2.addRequestProperty("accept-language","fr-CA");
    assertEquals("A",readAscii(connection2));
  }
  