headers.add(header)
      }

    /**
     * Adds a new header with the name and value. This may be used to add multiple headers with the
     * same name.
     */
    fun addHeader(
      name: String,
      value: Any,
    ) = apply {
      headers.add(name, value.toString())
    }

    /**
     * Adds a new header with the name and value. This may be used to add multiple headers with the

import okhttp3.internal.connection.RoutePlanner.Plan
import okhttp3.internal.okHttpName

/**
 * Speculatively connects to each IP address of a target address, returning as soon as one of them
 * connects successfully. This kicks off new attempts every 250 ms until a connect succeeds.
 */
internal class FastFallbackExchangeFinder(
  override val routePlanner: RoutePlanner,
  private val taskRunner: TaskRunner,
) : ExchangeFinder {

provided Accept-Encoding is not set previously.  Modern web servers
must choose to return Brotli responses.  n.b. It is not used for
sending requests.

```java
OkHttpClient client = new OkHttpClient.Builder()
  .addInterceptor(BrotliInterceptor.INSTANCE)
  .build();
```

```kotlin
implementation("com.squareup.okhttp3:okhttp-brotli:4.12.0")
```

    server.enqueue(
      MockResponse()
        .setResponseCode(HttpURLConnection.HTTP_MOVED_TEMP)
        .addHeader("Location: " + server.url("/new-path"))
        .setBody("This page has moved!"),
    )
    server.enqueue(MockResponse().setBody("This is the new location!"))
    val connection = server.url("/").toUrl().openConnection()
    val inputStream = connection.getInputStream()

    assertThat(source1.readUtf8(10)).isEqualTo("abcdefghij")
    assertThat(source1.exhausted()).isTrue()
    source1.close()
    assertThat(relay1.isClosed).isTrue()

    // Since relay1 is closed, new sources cannot be created.
    assertThat(relay1.newSource()).isNull()
    val relay2 = read(file)
    assertThat(relay2.metadata()).isEqualTo(metadata)
    val source2 = relay2.newSource()!!.buffer()

class IsProbablyUtf8Test {
  @Test fun isProbablyUtf8() {
    assertThat(Buffer().isProbablyUtf8()).isTrue()
    assertThat(Buffer().writeUtf8("abc").isProbablyUtf8()).isTrue()
    assertThat(Buffer().writeUtf8("new\r\nlines").isProbablyUtf8()).isTrue()
    assertThat(Buffer().writeUtf8("white\t space").isProbablyUtf8()).isTrue()
    assertThat(Buffer().writeByte(0x80).isProbablyUtf8()).isTrue()

 * ```java
 * String hostname = "publicobject.com";
 * CertificatePinner certificatePinner = new CertificatePinner.Builder()
 *     .add(hostname, "sha256/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=")
 *     .build();
 * OkHttpClient client = OkHttpClient.Builder()
 *     .certificatePinner(certificatePinner)
 *     .build();
 *
 * Request request = new Request.Builder()
 *     .url("https://" + hostname)
 *     .build();

 *    we must send a `CONNECT` request, and handle authorization challenges from the proxy.
 *  * Optional [TLS handshake][connectTls].
 *
 * Each step may fail. If a retry is possible, a new instance is created with the next plan, which
 * will be configured differently.
 */
class ConnectPlan(
  private val taskRunner: TaskRunner,
  private val connectionPool: RealConnectionPool,

    val response = client.newCall(request).execute()
    assertThat(response.body.string()).isEqualTo("response body")

    // First CONNECT call needs a new connection.
    assertThat(server.takeRequest().sequenceNumber).isEqualTo(0)

    // Second CONNECT call needs a new connection.
    assertThat(server.takeRequest().sequenceNumber).isEqualTo(0)

    // GET reuses the connection from the second connect.

   */
  @Throws(IOException::class)
  fun trailers(): Headers = trailersFn()

  /**
   * Peeks up to [byteCount] bytes from the response body and returns them as a new response
   * body. If fewer than [byteCount] bytes are in the response body, the full response body is
   * returned. If more than [byteCount] bytes are in the response body, the returned value