*  New: Defer constructing `Inflater` and `Deflater` instances until they are needed. This saves
    memory if web socket compression is negotiated but not used.


## Version 4.5.0-RC1

_2020-03-17_

**This release candidate turns on web socket compression.**

The [spec][rfc_7692] includes a sophisticated mechanism for client and server to negotiate

## Version 1.5.3

_2014-03-29_

 * Fix bug where the Content-Length header was not always dropped when
   following a redirect from a POST to a GET.
 * Implement basic support for `Thread.interrupt()`. OkHttp now checks
   for an interruption before doing a blocking call. If it is interrupted,
   it throws an `InterruptedIOException`.

## Version 1.5.2

_2014-03-17_

travelers

// travelersinsurance : 2015-03-26 Travelers TLD, LLC
travelersinsurance

// trust : 2014-10-16 Internet Naming Company LLC
trust

// trv : 2015-03-26 Travelers TLD, LLC
trv

// tube : 2015-06-11 Latin American Telecom LLC
tube

// tui : 2014-07-03 TUI AG
tui

// tunes : 2015-02-26 Amazon Registry Services, Inc.
tunes

## Version 3.14.6

_2020-01-11_

 *  Fix: Don't crash if the connection is closed when sending a degraded ping. This fixes a
    regression that was introduced in OkHttp 3.14.5.


## Version 3.14.5

_2020-01-03_

 *  Fix: Degrade HTTP/2 connections after a timeout. When an HTTP/2 stream times out it may impact
    the stream only or the entire connection. With this fix OkHttp will now send HTTP/2 pings after

    assertThat(formEncode(0)).isEqualTo("%00")
    assertThat(formEncode(1)).isEqualTo("%01")
    assertThat(formEncode(2)).isEqualTo("%02")
    assertThat(formEncode(3)).isEqualTo("%03")
    assertThat(formEncode(4)).isEqualTo("%04")
    assertThat(formEncode(5)).isEqualTo("%05")
    assertThat(formEncode(6)).isEqualTo("%06")
    assertThat(formEncode(7)).isEqualTo("%07")

    when OkHttp retrieves ALPN state on a closed connection.
 *  Upgrade: [Kotlin 1.6.21][kotlin_1_6_21].
 *  Upgrade: [Okio 3.1.0][okio_3_1_0].


## Version 5.0.0-alpha.6

_2022-03-14_

 *  Fix: Don't attempt to close pooled connections. We saw occasional fast fallback calls crash in
    the previous alpha due to an unexpected race.


## Version 5.0.0-alpha.5

_2022-02-21_

        "a=b; " +
          "Expires=Thu, 01 Jan 1970 00:00:02 GMT; " +
          "Expires=Thu, 01 Jan 1970 00:00:04 GMT; " +
          "Expires=Thu, 01 Jan 1970 00:00:01 GMT; " +
          "Expires=Thu, 01 Jan 1970 00:00:03 GMT",
      )!!.expiresAt,
    ).isEqualTo(3000L)
  }

  @Test fun maxAgeOrExpiresMakesCookiePersistent() {
    assertThat(parseCookie(0L, url, "a=b")!!.persistent).isFalse()

 *  Fix: Badly-behaving caches now throw a checked exception instead of a
    `NullPointerException`.
 *  Fix: Better handling of uncaught exceptions in MockWebServer with HTTP/2.

## Version 2.3.0

_2015-03-16_

 *  **HTTP/2 support.** We've done interop testing and haven't seen any
    problems. HTTP/2 support has been a big effort and we're particularly
    thankful to Adrian Cole who has helped us to reach this milestone.

 * Different instructions and configuration may be required for other hardware devices.
 *
 * Using a yubikey device as a SSL key store.
 * https://lauri.võsandi.com/2017/03/yubikey-for-ssh-auth.html
 *
 * Using PKCS11 support in the JDK.
 * https://tersesystems.com/blog/2018/09/08/keymanagers-and-keystores/
 *
 * Install OpenSC separately. On a mac `brew cast install opensc`.
 */

OkHttp tracks the dynamic TLS ecosystem to balance connectivity and security. This page is a log of
changes we've made over time to OkHttp's default TLS options.

[OkHttp 3.14][OkHttp314]
------------------------

_2019-03-14_

Remove 2 TLSv1.3 cipher suites that are neither available on OkHttp’s host platforms nor enabled in releases of Chrome and Firefox.

##### RESTRICTED_TLS cipher suites

 * TLS_AES_128_GCM_SHA256[¹][tlsv13_only]