@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()

        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"
    )

      body: RequestBody?,
    ): 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."