code: @Test public void clientConfiguredCustomContentEncoding() throws Exception {
    server.enqueue(new MockResponse().setBody("ABCDE").addHeader("Content-Encoding: custom"));
    server.play();
    URLConnection connection=client.open(server.getUrl("/"));
    connection.addRequestProperty("Accept-Encoding","custom");
    assertEquals("ABCDE",readAscii(connection.getInputStream(),Integer.MAX_VALUE));
    RecordedRequest request=server.takeRequest();
    assertContains(request.getHeaders(),"Accept-Encoding: custom");
  }
  