MockResponse.Builder()
        .body(gzippedBody)
        .addHeader("Content-Encoding: gzip")
        .build(),
    )

    // Confirm that the user request doesn't have Accept-Encoding, and the user
    // response doesn't have a Content-Encoding or Content-Length.
    val userResponse = executeSynchronously("/")
    userResponse.assertCode(200)
      .assertRequestHeader("Accept-Encoding")

        "Etag", "a", "Cache-Control", "max-age=0",
        "A", "a1", "B", "b2", "B", "b3", "Content-Length", "4",
      ),
    )

    // The original 'A' header is retained because the network response doesn't have one.
    // The original 'B' headers are replaced by the network response.
    // The network's 'C' header is added.
    val response2 = get(server.url("/"))
    assertThat(response2.body.string()).isEqualTo("abcd")