// 	If-None-Match condition evaluates to false , and;
			//  If-Modified-Since condition evaluates to true ;
			// 	Then Amazon S3 returns the 304 Not Modified response code.
			// 2. If If-Modified-Since condition evaluates to false, The following `ifModifiedSinceHeader` judgment will also return 304

			// If the object ETag matches with the specified ETag.
			writeHeadersPrecondition(w, objInfo)
			w.WriteHeader(http.StatusNotModified)

     * The status code for Not Modified.
     */
    public static final int NOT_MODIFIED_STATUS = 304;

    /**
     * The HTTP status code for OK.
     */
    public static final int OK_STATUS_CODE = 200;

    /**
     * The HTTP status code for Not Modified.
     */
    public static final int NOT_MODIFIED_STATUS_CODE = 304;

    /**
     * The HTTP status code for Bad Request.
     */

* **`300 - 399`** are for "Redirection".  Responses with these status codes may or may not have a body, except for `304`, "Not Modified", which must not have one.
* **`400 - 499`** are for "Client error" responses. These are the second type you would probably use the most.
    * An example is `404`, for a "Not Found" response.

     * Datetime format. This format allows you to omit the time portion, if
     * desired, and use YYYY-MM-DD.
     *
     * Note that this tag is separate from the If-Modified-Since (304) header
     * the server can return, and search engines may use the information from
     * both sources differently.
     */
    private String lastmod;

    /**

    assertEquals(4, stats.requestCount());
    assertEquals(1, stats.hitCount());
    assertThat(stats.hitRate()).isEqualTo(1.0 / 4);
    assertEquals(3, stats.missCount());
    assertThat(stats.missRate()).isEqualTo(3.0 / 4);
    assertEquals(3, stats.loadCount());
    assertTrue(stats.totalLoadTime() >= totalLoadTime);
    assertTrue(stats.averageLoadPenalty() >= 0.0);
    assertEquals(1, stats.evictionCount());
  }

  - [Changelog since v1.30.4](#changelog-since-v1304)
  - [Changes by Kind](#changes-by-kind-9)
    - [API Change](#api-change-1)
    - [Feature](#feature-6)
    - [Bug or Regression](#bug-or-regression-7)
  - [Dependencies](#dependencies-9)
    - [Added](#added-9)
    - [Changed](#changed-9)
    - [Removed](#removed-9)
- [v1.30.4](#v1304)
  - [Downloads for v1.30.4](#downloads-for-v1304)

      Header(TARGET_SCHEME, "http"),
      Header(TARGET_SCHEME, "https"),
      Header(RESPONSE_STATUS, "200"),
      Header(RESPONSE_STATUS, "204"),
      Header(RESPONSE_STATUS, "206"),
      Header(RESPONSE_STATUS, "304"),
      Header(RESPONSE_STATUS, "400"),
      Header(RESPONSE_STATUS, "404"),
      Header(RESPONSE_STATUS, "500"),
      Header("accept-charset", ""),
      Header("accept-encoding", "gzip, deflate"),

                    processor.setTransformer(container.getComponent("fileTransformer"));
                    processor.setSuccessfulHttpCodes(new int[] { 200 });
                    processor.setNotModifiedHttpCodes(new int[] { 304 });
                })//
                .<RegexRule> singleton("fileRule", RegexRule.class, rule -> {
                    rule.setRuleId("fileRule");
                    rule.setDefaultRule(true);

    assertCached(false, 207)
    assertCached(true, 300)
    assertCached(true, 301)
    assertCached(true, 302)
    assertCached(false, 303)
    assertCached(false, 304)
    assertCached(false, 305)
    assertCached(false, 306)
    assertCached(true, 307)
    assertCached(true, 308)
    assertCached(false, 400)
    assertCached(false, 401)
    assertCached(false, 402)

// The responses for fetching the object when If-Modified-Since
// and If-Unmodified-Since headers set are validated.
// If-Modified-Since - Return the object only if it has been modified since the specified time, else return a 304 (not modified).
// If-Unmodified-Since - Return the object only if it has not been modified since the specified time, else return a 412 (precondition failed).
func (s *TestSuiteCommon) TestHeadOnObjectLastModified(c *check) {