public void clear() {
      ReferenceEntry<K, V> e = head.getNextInWriteQueue();
      while (e != head) {
        ReferenceEntry<K, V> next = e.getNextInWriteQueue();
        nullifyWriteOrder(e);
        e = next;
      }

      head.setNextInWriteQueue(head);
      head.setPreviousInWriteQueue(head);
    }

    @Override
    public Iterator<ReferenceEntry<K, V>> iterator() {

    public void clear() {
      ReferenceEntry<K, V> e = head.getNextInWriteQueue();
      while (e != head) {
        ReferenceEntry<K, V> next = e.getNextInWriteQueue();
        nullifyWriteOrder(e);
        e = next;
      }

      head.setNextInWriteQueue(head);
      head.setPreviousInWriteQueue(head);
    }

    @Override
    public Iterator<ReferenceEntry<K, V>> iterator() {

How she longed to get out of that dark hall, and wander about
among those beds of bright flowers and those cool fountains, but
she could not even get her head though the doorway; `and even if
my head would go through,' thought poor Alice, `it would be of
very little use without my shoulders.  Oh, how I wish
I could shut up like a telescope!  I think I could, if I only

How she longed to get out of that dark hall, and wander about
among those beds of bright flowers and those cool fountains, but
she could not even get her head though the doorway; `and even if
my head would go through,' thought poor Alice, `it would be of
very little use without my shoulders.  Oh, how I wish
I could shut up like a telescope!  I think I could, if I only

    assertThat(server.takeRequest().sequenceNumber).isEqualTo(1)
  }

  @Test
  fun head_HTTPS() {
    enableTls()
    head()
  }

  @Test
  fun head_HTTP_2() {
    enableProtocol(Protocol.HTTP_2)
    head()
  }

  @Test
  fun post() {
    server.enqueue(MockResponse(body = "abc"))
    val request =
      Request(

	c.Assert(response.StatusCode, http.StatusNoContent)
}

// TestNonExistentBucket - Asserts response for HEAD on non-existent bucket.
func (s *TestSuiteCommon) TestNonExistentBucket(c *check) {
	// generate a random bucket name.
	bucketName := getRandomBucketName()
	// create request to HEAD on the bucket.
	// HEAD on an bucket helps validate the existence of the bucket.

    testRedirect(false, "HEAD")
  }

  @Test
  fun response308WithOptions() {
    testRedirect(false, "OPTIONS")
  }

  @Test
  fun response308WithPost() {
    testRedirect(false, "POST")
  }

  /**
   * In OkHttp 4.5 and earlier, HTTP 307 and 308 redirects were only honored if the request method
   * was GET or HEAD.
   *

    server.enqueue(
      MockResponse.Builder()
        .addHeader("Allow: GET, HEAD")
        .addHeader("Last-Modified: " + formatDate(-1, TimeUnit.HOURS))
        .addHeader("Cache-Control: max-age=0")
        .body("A")
        .build(),
    )
    server.enqueue(
      MockResponse.Builder()
        .addHeader("Allow: GET, HEAD, PUT")
        .code(HttpURLConnection.HTTP_NOT_MODIFIED)
        .build(),

          "exemplar": true,
          "expr": "sum by (bucket) (minio_bucket_replication_proxied_head_requests_total{job=\"$scrape_jobs\"})",
          "interval": "1m",
          "intervalFactor": 2,
          "legendFormat": "{{bucket}}",
          "refId": "A"
        }
      ],
      "title": "Total Proxied Head Requests",
      "type": "timeseries"
    },
    {
      "datasource": {

		recV2 := httptest.NewRecorder()
		// construct HTTP request for Head Object endpoint.
		reqV2, err := newTestSignedRequestV2(http.MethodHead, getHeadObjectURL("", testCase.bucketName, testCase.objectName),
			0, nil, testCase.accessKey, testCase.secretKey, nil)
		if err != nil {
			t.Fatalf("Test %d: %s: Failed to create HTTP request for Head Object: <ERROR> %v", i+1, instanceType, err)
		}