```java
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
logging.setLevel(Level.BASIC);
OkHttpClient client = new OkHttpClient.Builder()
  .addInterceptor(logging)
  .build();
```

You can change the log level at any time by calling `setLevel()`.

To log to a custom location, pass a `Logger` instance to the constructor.
```java

import org.junit.runner.RunWith
import org.robolectric.RobolectricTestRunner
import org.robolectric.shadows.ShadowLog

@RunWith(RobolectricTestRunner::class)
class AndroidLoggingTest {
  val clientBuilder =
    OkHttpClient.Builder().connectionSpecs(listOf(ConnectionSpec.CLEARTEXT)).dns {
      throw UnknownHostException("shortcircuit")
    }

  val request = Request("http://google.com/robots.txt".toHttpUrl())

  @Test

  @Test fun get() {
    server.enqueue(MockResponse(body = "hello, OkHttp"))

    val client = OkHttpClient()

    val request =
      Request
        .Builder()
        .url(server.url("/"))
        .header("Accept", "text/plain")
        .build()
    val response = client.newCall(request).execute()
    assertThat(response.code).isEqualTo(200)
    assertThat(response.body.string()).isEqualTo("hello, OkHttp")

public final class AsynchronousGet {
  private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    Request request = new Request.Builder()
        .url("http://publicobject.com/helloworld.txt")
        .build();

    client.newCall(request).enqueue(new Callback() {
      @Override public void onFailure(Call call, IOException e) {
        e.printStackTrace();
      }

    ImmutableList.Builder<List<E>> axesBuilder = new ImmutableList.Builder<>(lists.size());
    for (List<? extends E> list : lists) {
      List<E> copy = ImmutableList.copyOf(list);
      if (copy.isEmpty()) {
        return ImmutableList.of();
      }
      axesBuilder.add(copy);
    }
    return new CartesianList<>(axesBuilder.build());
  }

  CartesianList(ImmutableList<List<E>> axes) {

@RunWith(AndroidJUnit4.class)
public class OkHttpClientTest {
  @Test public void get() throws IOException {
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder()
        .url("https://google.com/robots.txt")
        .build();
    try (Response response = client.newCall(request).execute()) {
      assertEquals(200, response.code());
      assertEquals(Protocol.HTTP_2, response.protocol());
    }
  }

import okhttp3.Request
import okhttp3.Response

class AsynchronousGet {
  private val client = OkHttpClient()

  fun run() {
    val request =
      Request
        .Builder()
        .url("http://publicobject.com/helloworld.txt")
        .build()

    client.newCall(request).enqueue(
      object : Callback {
        override fun onFailure(
          call: Call,
          e: IOException,
        ) {

    val request = realChain.request
    val requestBody = request.body
    val sentRequestMillis = System.currentTimeMillis()

    var invokeStartEvent = true
    var responseBuilder: Response.Builder? = null
    var sendRequestException: IOException? = null
    val hasRequestBody = HttpMethod.permitsRequestBody(request.method) && requestBody != null
    val isUpgradeRequest =
      !hasRequestBody &&

    fun readHttp2HeadersList(
      headerBlock: Headers,
      protocol: Protocol,
    ): Response.Builder {
      var statusLine: StatusLine? = null
      val headersBuilder = Headers.Builder()
      for (i in 0 until headerBlock.size) {
        val name = headerBlock.name(i)
        val value = headerBlock.value(i)
        if (name == RESPONSE_STATUS_UTF8) {

      factory("com.google.android.gms.org.conscrypt")

    /**
     * Builds a SocketAdapter from an observed implementation class, by grabbing the Class
     * reference to perform reflection on at runtime.
     *
     * @param actualSSLSocketClass the runtime class of Conscrypt class socket.
     */
    private fun build(actualSSLSocketClass: Class<in SSLSocket>): AndroidSocketAdapter {