when you call `contains(null)` on them!
 *  Fix: Retain binary-compatibility in `okhttp3.internal.HttpHeaders.hasBody()`. Some unscrupulous
    coders call this and we don't want their users to suffer.


## Version 4.0.0

_2019-06-26_

**This release upgrades OkHttp to Kotlin.** We tried our best to make fast and safe to upgrade

          .header("User-Agent", "baz")
          .build(),
      )
    assertContent("encrypted response from the origin server", response)
    val connect = server.takeRequest()
    assertThat(connect.headers["Private"]).isNull()
    assertThat(connect.headers["Proxy-Authorization"]).isNull()
    assertThat(connect.headers["User-Agent"]).isEqualTo(USER_AGENT)

01-01 12:53:32.818 10999 11090 D OkHttp  : [56 ms] connectionReleased
01-01 12:53:32.818 10999 11090 D OkHttp  : [56 ms] callEnd
```

3. Run tests using gradle

```
$ ANDROID_SDK_ROOT=/Users/myusername/Library/Android/sdk ./gradlew :android-test:connectedCheck -PandroidBuild=true
...
> Task :android-test:connectedDebugAndroidTest
...
11:55:40 V/InstrumentationResultParser: Time: 13.271

    }
    assertThat(socket.enabledCipherSuites)
      .containsExactly(*expectedCipherSuites.toTypedArray())
  }

  @Test
  fun tls_stringCiphersAndVersions() {
    // Supporting arbitrary input strings allows users to enable suites and versions that are not
    // yet known to the library, but are supported by the platform.
    ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
      .cipherSuites("MAGIC-CIPHER")

**This release introduces new Kotlin-friendly APIs.** When we migrated OkHttp from Java to Kotlin in
OkHttp 4.0, we kept our Java-first APIs. With 5.0 we're continuing to support Java and adding
additional improvements for Kotlin users. In this alpha we're excited to skip-the-builder for
requests and remove a common source of non-null assertions (`!!`) on the response body.

Applications expected to be installed on older Android devices should consider adopting the
[Google Play Services’ ProviderInstaller][provider_installer]. This will increase security for users
and increase connectivity with web servers.

### Certificate Pinning ([.kt][CertificatePinningKotlin], [.java][CertificatePinningJava])

on-aptible.com

// ASEINet : https://www.aseinet.com/
// Submitted by Asei SEKIGUCHI <******@****.***>
user.aseinet.ne.jp
gv.vc
d.gv.vc

// Asociación Amigos de la Informática "Euskalamiga" : http://encounter.eus/
// Submitted by Hector Martin <******@****.***>
user.party.eus

// Association potager.org : https://potager.org/
// Submitted by Lunar <******@****.***>