.build(),
    )
    val url = server.url("/")
    assertThat(get(url).body.string()).isEqualTo("A")
    val request =
      Request.Builder()
        .url(url)
        .method("POST", requestBodyOrNull("POST"))
        .build()
    val invalidate = client.newCall(request).execute()
    assertThat(invalidate.body.string()).isEqualTo("B")
    assertThat(get(url).body.string()).isEqualTo("C")
  }