## Version 4.0.0

_2019-06-26_

**This release upgrades OkHttp to Kotlin.** We tried our best to make fast and safe to upgrade
from OkHttp 3.x. We wrote an [upgrade guide][upgrading_to_okhttp_4] to help with the migration and a
[blog post][okhttp4_blog_post] to explain it.

 *  Fix: Target Java 8 bytecode for Java and Kotlin.


## Version 4.0.0-RC3

    val response = get(server.url("/"))
    assertThat(response.header("")).isEqualTo("A")
    assertThat(response.body.string()).isEqualTo("body")
  }

  /**
   * Old implementations of OkHttp's response cache wrote header fields like ":status: 200 OK". This
   * broke our cached response parser because it split on the first colon. This regression test
   * exists to help us read these old bad cache entries.
   *

kosaka.akita.jp
kyowa.akita.jp
misato.akita.jp
mitane.akita.jp
moriyoshi.akita.jp
nikaho.akita.jp
noshiro.akita.jp
odate.akita.jp
oga.akita.jp
ogata.akita.jp
semboku.akita.jp
yokote.akita.jp
yurihonjo.akita.jp
aomori.aomori.jp
gonohe.aomori.jp
hachinohe.aomori.jp
hashikami.aomori.jp
hiranai.aomori.jp
hirosaki.aomori.jp
itayanagi.aomori.jp
kuroishi.aomori.jp

07FB..07FC    ; disallowed                             # NA   <reserved-07FB>..<reserved-07FC>
07FD          ; valid                                  # 11.0 NKO DANTAYALAN
07FE..07FF    ; valid                  ;      ; NV8    # 11.0 NKO DOROME SIGN..NKO TAMAN SIGN
0800..082D    ; valid                                  # 5.2  SAMARITAN LETTER ALAF..SAMARITAN MARK NEQUDAA
082E..082F    ; disallowed                             # NA   <reserved-082E>..<reserved-082F>