ImmutableMultiset.Builder<String> builder = ImmutableMultiset.builder();
    builder.addCopies("a", 2);
    builder.add("b");
    builder.add("c");
    builder.setCount("b", 0);
    ImmutableMultiset<String> multiset = builder.build();
    assertThat(multiset.elementSet()).containsExactly("a", "c").inOrder();
    builder.add("b");
    assertThat(builder.build().elementSet()).containsExactly("a", "c", "b").inOrder();

```java
HeldCertificate rootCertificate = new HeldCertificate.Builder()
    .certificateAuthority(1)
    .build();

HeldCertificate intermediateCertificate = new HeldCertificate.Builder()
    .certificateAuthority(0)
    .signedBy(rootCertificate)
    .build();

HeldCertificate serverCertificate = new HeldCertificate.Builder()
    .addSubjectAlternativeName("localhost")
    .signedBy(intermediateCertificate)

    unused = builder.build(); // this is *also* allowed
  }

  public void testBuildMutate() {
    ThreadFactory factory1 = builder.setPriority(1).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

    builder.setPriority(2); // change the state of the builder
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());
  }

  @Test
  fun ecdsaSignedByRsa() {
    val root =
      HeldCertificate
        .Builder()
        .certificateAuthority(0)
        .rsa2048()
        .build()
    val leaf =
      HeldCertificate
        .Builder()
        .certificateAuthority(0)
        .ecdsa256()
        .signedBy(root)
        .build()
    assertThat(root.certificate.sigAlgName).isEqualTo("SHA256WITHRSA", ignoreCase = true)

  @Test fun headersEquals() {
    val headers1 =
      Headers
        .Builder()
        .add("Connection", "close")
        .add("Transfer-Encoding", "chunked")
        .build()
    val headers2 =
      Headers
        .Builder()
        .add("Connection", "close")
        .add("Transfer-Encoding", "chunked")
        .build()
    assertThat(headers2).isEqualTo(headers1)

where it's available.

To opt-in, configure your `OkHttpClient.Builder`:


```
OkHttpClient client = new OkHttpClient.Builder()
    .fastFallback(true)
    .build();
```

 *  New: Change the build from Kotlin-JVM to Kotlin-multiplatform (which includes JVM). Both
    native and JavaScript platforms are unstable preview releases and subject to

  @Test
  fun processResponse() {
    server.enqueue(
      MockResponse
        .Builder()
        .body(
          """
          |data: hey
          |
          |
          """.trimMargin(),
        ).setHeader("content-type", "text/event-stream")
        .build(),
    )
    val request = Request.Builder().url(server.url("/")).build()
    val response = client.newCall(request).execute()

      ImmutableList.Builder<String> builder = ImmutableList.builder();
      assertThrows(NullPointerException.class, () -> builder.addAll((Iterable<String>) null));
    }

    {
      ImmutableList.Builder<String> builder = ImmutableList.builder();
      assertThrows(NullPointerException.class, () -> builder.addAll((Iterator<String>) null));
    }

    {
      ImmutableList.Builder<String> builder = ImmutableList.builder();

    val certificatePinner =
      CertificatePinner
        .Builder()
        .add(server.hostName, "sha256/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=")
        .build()
    client = client.newBuilder().certificatePinner(certificatePinner).build()

    server.enqueue(MockResponse(body = "abc"))

    val request = Request.Builder().url(server.url("/")).build()

    try {
      client.newCall(request).execute()

```java
OkHttpClient client = new OkHttpClient();

String run(String url) throws IOException {
  Request request = new Request.Builder()
      .url(url)
      .build();

  try (Response response = client.newCall(request).execute()) {
    return response.body().string();
  }
}
```


Post to a Server
----------------