@Test
  fun permitsRequestBody() {
    assertTrue(permitsRequestBody("POST"))
    assertFalse(permitsRequestBody("GET"))
  }

  @Test
  fun requiresRequestBody() {
    assertTrue(requiresRequestBody("PUT"))
    assertFalse(requiresRequestBody("GET"))
  }

  @Test
  fun hasBody() {
    val request = Request.Builder().url("http://example.com").build()
    val response =
      Response.Builder().code(200)

      method == "POST" || method == "PATCH" || method == "PUT" ||
        method == "DELETE" || method == "MOVE"
    )

  @JvmStatic // Despite being 'internal', this method is called by popular 3rd party SDKs.
  fun requiresRequestBody(method: String): Boolean =
    (
      method == "POST" || method == "PUT" ||
        method == "PATCH" || method == "PROPPATCH" || // WebDAV
        method == "REPORT"
    )

  method: String,
  body: RequestBody?,
): Request.Builder =
  apply {
    require(method.isNotEmpty()) {
      "method.isEmpty() == true"
    }
    if (body == null) {
      require(!HttpMethod.requiresRequestBody(method)) {
        "method $method must have a request body."
      }
    } else {
      require(HttpMethod.permitsRequestBody(method)) {
        "method $method must not have a request body."
      }