}

  private fun addInterceptor(
    network: Boolean,
    interceptor: Interceptor,
  ) {
    val builder = client.newBuilder()
    if (network) {
      builder.addNetworkInterceptor(interceptor)
    } else {
      builder.addInterceptor(interceptor)
    }
    client = builder.build()
  }

  /** Catches exceptions that are otherwise headed for the uncaught exception handler.  */

  @Test
  fun emptyNameForbidden() {
    val builder = Request.Builder()
    assertFailsWith<IllegalArgumentException> {
      builder.header("", "Value")
    }
    assertFailsWith<IllegalArgumentException> {
      builder.addHeader("", "Value")
    }
  }

  @Test
  fun headerAllowsTabOnlyInValues() {
    val builder = Request.Builder()
    builder.header("key", "sample\tvalue")

  @Test
  fun cookieBuilder() {
    var builder: Cookie.Builder = Cookie.Builder()
    builder = builder.name("")
    builder = builder.value("")
    builder = builder.expiresAt(0L)
    builder = builder.domain("")
    builder = builder.hostOnlyDomain("")
    builder = builder.path("")
    builder = builder.secure()
    builder = builder.httpOnly()
    builder = builder.sameSite("None")

    ImmutableListMultimap.Builder<String, Integer> builder = ImmutableListMultimap.builder();
    builder.put("b", 3);
    builder.put("d", 2);
    builder.put("a", 5);
    builder.orderValuesBy(Collections.reverseOrder());
    builder.put("c", 4);
    builder.put("a", 2);
    builder.put("b", 6);
    ImmutableListMultimap<String, Integer> multimap = builder.build();

      |
      """.trimMargin().replace("\n", "\r\n")
    val body =
      MultipartBody
        .Builder("AaB03x")
        .setType(MultipartBody.FORM)
        .addFormDataPart("submit-name", "Larry")
        .addFormDataPart(
          "files",
          null,
          MultipartBody
            .Builder("BbC04y")
            .addPart(
              headersOf("Content-Disposition", "file; filename=\"file1.txt\""),

    return new ImmutableClassToInstanceMap<>(map);
  }

  /**
   * Returns a new builder. The generated builder is equivalent to the builder created by the {@link
   * Builder} constructor.
   */
  public static <B> Builder<B> builder() {
    return new Builder<>();
  }

  /**
   * A builder for creating immutable class-to-instance maps. Example:
   *
   * {@snippet :

    ImmutableSetMultimap.Builder<String, Integer> builder = ImmutableSetMultimap.builder();
    builder.put("b", 3);
    builder.put("d", 2);
    builder.put("a", 5);
    builder.orderValuesBy(Collections.reverseOrder());
    builder.put("c", 4);
    builder.put("a", 2);
    builder.put("b", 6);
    ImmutableSetMultimap<String, Integer> multimap = builder.build();

      MockResponse
        .Builder()
        .code(HttpURLConnection.HTTP_MOVED_TEMP)
        .setHeader("Location", otherServer.url("/"))
        .build(),
    )
    otherServer.enqueue(
      MockResponse
        .Builder()
        .headersDelay(500, TimeUnit.MILLISECONDS)
        .build(),
    )
    val request = Request.Builder().url(server.url("/")).build()
    val call = client.newCall(request)

    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());
  }

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