_2020-08-06_

 *  Fix: Don't crash in `HeldCertificate.Builder` when creating certificates on older versions of
    Android, including Android 6. We were using a feature of `SimpleDateFormat` that wasn't
    available in those versions!


## Version 4.8.0

_2020-07-11_

 *  New: Change `HeldCertificate.Builder` to use its own ASN.1 certificate encoder. This is part

    val inputStream = response.body.byteStream()
    for (i in 0 until body.length) {
      assertThat(inputStream.available()).isGreaterThanOrEqualTo(0)
      assertThat(inputStream.read()).isEqualTo(body[i].code)
    }
    assertThat(inputStream.available()).isEqualTo(0)
    assertThat(inputStream.read()).isEqualTo(-1)
  }

  @Test
  fun postFailsWithBufferedRequestForSmallRequest() {

The latest release is available on [Maven Central](https://search.maven.org/artifact/com.squareup.okhttp3/okhttp/4.12.0/jar).

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

Snapshot builds are [available][snap]. [R8 and ProGuard][r8_proguard] rules are available.

    CipherSuite.TLS_AES_128_CCM_8_SHA256,
  )

/**
 * A TLS 1.3 only Connection Spec. This will be eventually be exposed
 * as part of MODERN_TLS or folded into the default OkHttp client once published and
 * available in JDK11 or Conscrypt.
 */
private val TLS_13 =
  ConnectionSpec.Builder(true)
    .cipherSuites(*TLS13_CIPHER_SUITES.toTypedArray())
    .tlsVersions(TlsVersion.TLS_1_3)
    .build()

private val TLS_12 =

          .protocol(statusLine.protocol)
          .code(statusLine.code)
          .message(statusLine.message)
          .headers(headersReader.readHeaders())
          .trailers { error("trailers not available") }

      return when {
        expectContinue && statusLine.code == HTTP_CONTINUE -> {
          null
        }
        statusLine.code == HTTP_CONTINUE -> {
          state = STATE_READ_RESPONSE_HEADERS

   * other adapters on this SEQUENCE to interrogate.
   */
  fun asTypeHint(): BasicDerAdapter<T> = copy(typeHint = true)

  // Avoid Long.hashCode(long) which isn't available on Android 5.
  override fun hashCode(): Int {
    var result = 0
    result = 31 * result + name.hashCode()
    result = 31 * result + tagClass
    result = 31 * result + tag.toInt()

import org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement

/**
 * This extends [X509ExtendedTrustManager] to disable verification for a set of hosts.
 *
 * Note that the superclass [X509ExtendedTrustManager] isn't available on Android until version 7
 * (API level 24).
 */
@IgnoreJRERequirement
internal class InsecureExtendedTrustManager(
  private val delegate: X509ExtendedTrustManager,
  private val insecureHosts: List<String>,

    val response =
      newResponse("".toResponseBody()) {
        // All live paths (Http1, Http2) in OkHttp do this
        trailers { error("trailers not available") }
      }

    assertFailsWith<IllegalStateException>(message = "trailers not available") {
      response.trailers()
    }
  }

  @Test
  fun worksIfTrailersSet() {
    val response =
      newResponse("".toResponseBody()) {
        trailers {

unable to deliver its IOException to the application. We would have told the application layer that the write succeeded, but it didn't!

The application-layer can also do blocking reads. If the application asks to read and there's nothing available, we need to hold that thread until either the bytes arrive, the stream is closed, or a timeout elapses. If we get bytes but there's nobody asking for them, we buffer them. We don't consider bytes as delivered for flow control until they're consumed...

## Retrying Requests

Sometimes connections fail: either a pooled connection was stale and disconnected, or the webserver itself couldn’t be reached. OkHttp will retry the request with a different route if one is available.

## [Calls](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-call/)