## Version 4.0.0-RC1

_2019-06-03_

 *  First stable preview of OkHttp 4.


## Version 3.x

[Change log](https://square.github.io/okhttp/changelog_3x/)


 [bom]: https://docs.gradle.org/6.2/userguide/platforms.html#sub:bom_import
 [bouncy_castle_releases]: https://www.bouncycastle.org/releasenotes.html
 [CVE-2021-0341]: https://nvd.nist.gov/vuln/detail/CVE-2021-0341

    if (Build.VERSION.SDK_INT >= 24) {
      localhostInsecureRequest()
    }
  }

  @Test
  fun testRequestWithSniRequirement() {
    assumeNetwork()

    val request = Request.Builder().url("https://docs.fabric.io/android/changelog.html").build()

    val response = client.newCall(request).execute()

    response.use {
      assertEquals(200, response.code)
    }
  }

  @Test

 * Conscrypt.
 *
 * [iana_tls_parameters]: https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml
 * [sslengine]: https://developer.android.com/reference/javax/net/ssl/SSLEngine.html
 * [oracle_providers]: https://docs.oracle.com/javase/10/security/oracle-providers.htm
 * [conscrypt_providers]: https://github.com/google/conscrypt/blob/master/common/src/main/java/org/conscrypt/NativeCrypto.java
 */
class CipherSuite private constructor(
  /**

 * `CLEARTEXT` is an insecure configuration that is used for `http://` URLs.

These loosely follow the model set in [Google Cloud Policies](https://cloud.google.com/load-balancing/docs/ssl-policies-concepts). We [track changes](../security/tls_configuration_history.md) to this policy.

 * [Lets Encrypt's ASN.1 and DER][asn1_and_der] guide.
 *
 * [x690]: https://www.itu.int/rec/T-REC-X.690
 * [asn1_and_der]: https://letsencrypt.org/docs/a-warm-welcome-to-asn1-and-der/
 */
internal class DerReader(source: Source) {
  private val countingSource: CountingSource = CountingSource(source)
  private val source: BufferedSource = countingSource.buffer()

[kotlin_1_7_10]: https://github.com/JetBrains/kotlin/releases/tag/v1.7.10
[kotlin_1_9_21]: https://github.com/JetBrains/kotlin/releases/tag/v1.9.21
[kotlin_1_9_23]: https://github.com/JetBrains/kotlin/releases/tag/v1.9.23
[loom]: https://docs.oracle.com/en/java/javase/21/core/virtual-threads.html
[okio_2_9_0]: https://square.github.io/okio/changelog/#version-290
[okio_3_0_0]: https://square.github.io/okio/changelog/#version-300

 [advanced_profiling_bug]: https://issuetracker.google.com/issues/135141615
 [japicmp]: https://github.com/siom79/japicmp
 [japicmp_gradle]: https://github.com/melix/japicmp-gradle-plugin
 [java_sams]: https://kotlinlang.org/docs/reference/java-interop.html#sam-conversions
 [kotlin_sams]: https://youtrack.jetbrains.com/issue/KT-11129
 [mockito]: https://site.mockito.org/
 [proguard_problems]: https://github.com/square/okhttp/issues/5167

Typically HTTP headers work like a `Map<String, String>`: each field has one value or none. But some headers permit multiple values, like Guava's [Multimap](https://guava.dev/releases/23.0/api/docs/com/google/common/collect/Multimap.html). For example, it's legal and common for an HTTP response to supply multiple `Vary` headers. OkHttp's APIs attempt to make both cases comfortable.

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