Map<String, List<String>> headers = new HashMap<>();
        headers.put("Accept", Arrays.asList("application/json", "text/html"));
        response.setHeaders(headers);

        String[] acceptValues = response.getHeaderValues("Accept");
        String[] acceptValuesLowercase = response.getHeaderValues("accept"); // Test case insensitive
        String[] missingValues = response.getHeaderValues("Missing-Header");

        .newBuilder(server.url("/").toUri())
        .header("Accept", "text/plain")
        .build()

    val response = httpClient.send(request, BodyHandlers.ofString())
    assertThat(response.statusCode()).isEqualTo(200)
    assertThat(response.body()).isEqualTo("hello, Java HTTP Client")

    val recorded = server.takeRequest()
    assertThat(recorded.headers["Accept"]).isEqualTo("text/plain")

                  <summary>
                    If you did this intentionally, please accept the change and provide an explanation:
                    <span class="btn btn-info" role="button">Accept this change</span>
                  </summary>
                  <div class="well">
                    In order to accept this change add the following to <code>${relativePathToMainApiChanges()}</code>:

  /** The HTTP {@code Accept} header field name. */
  public static final String ACCEPT = "Accept";

  /** The HTTP {@code Accept-Charset} header field name. */
  public static final String ACCEPT_CHARSET = "Accept-Charset";

  /** The HTTP {@code Accept-Encoding} header field name. */
  public static final String ACCEPT_ENCODING = "Accept-Encoding";

  /** The HTTP {@code Accept-Language} header field name. */

        } catch (IOException e) {
            throw UncheckedException.throwAsUncheckedException(e);
        }
    }

    /**
     * Automatically accept changes that are valid property upgrades of a getter or setter.
     *
     * Here we automatically accept the following cases:
     * - A setter `setX` of an upgraded property is removed
     * - A boolean `isX` of an upgraded property is removed

    request.addHeader("Accept", "text/plain")

    @Suppress("DEPRECATION")
    httpClient.execute(request).use { response ->
      assertThat(response.code).isEqualTo(200)
      assertThat(EntityUtils.toString(response.entity)).isEqualTo("hello, Apache HttpClient 5.x")
    }

    val recorded = server.takeRequest()
    assertThat(recorded.headers["Accept"]).isEqualTo("text/plain")
    assertThat(

  /**
   * Invokes {@code latch.}{@link CountDownLatch#await(long, TimeUnit) await(timeout, unit)}
   * uninterruptibly.
   */
  @J2ktIncompatible
  @GwtIncompatible // concurrency
  @SuppressWarnings("GoodTime") // should accept a java.time.Duration
  public static boolean awaitUninterruptibly(CountDownLatch latch, long timeout, TimeUnit unit) {
    boolean interrupted = false;
    try {
      long remainingNanos = unit.toNanos(timeout);

          forEach(prefix, consumer);
        }
        long size = spliterator.getExactSizeIfKnown();
        long[] counter = {0};
        spliterator.forEachRemaining(
            e -> {
              consumer.accept(e);
              counter[0]++;
            });
        if (size >= 0) {
          assertEquals(size, counter[0]);
        }
      }
    },
    ALTERNATE_ADVANCE_AND_SPLIT {
      @Override

          forEach(prefix, consumer);
        }
        long size = spliterator.getExactSizeIfKnown();
        long[] counter = {0};
        spliterator.forEachRemaining(
            e -> {
              consumer.accept(e);
              counter[0]++;
            });
        if (size >= 0) {
          assertEquals(size, counter[0]);
        }
      }
    },
    ALTERNATE_ADVANCE_AND_SPLIT {
      @Override

        .url(url)
        .header("Accept-Language", "fr-CA")
        .header("Accept-Charset", "UTF-8")
        .header("Accept-Encoding", "identity")
        .build()
    val response1 = client.newCall(request).execute()
    assertThat(response1.body.string()).isEqualTo("A")
    val request1 =
      Request
        .Builder()
        .url(url)
        .header("Accept-Language", "fr-CA")