v5.2.1

2025-10-09

• Fix: Don't crash when calling Socket.shutdownOutput() or shutdownInput() on an SSLSocket
  on Android API 21 through 23. This method throws an UnsupportedOperationException, so we now
  catch that and close the underlying stream instead.

• Upgrade: [Okio 3.16.1][okio_3_16_1].

v5.2.0

2025-10-07

• New: Support [HTTP 101] responses with Response.socket. This mechanism is only supported on
  HTTP/1.1. We also reimplemented our websocket client to use this new mechanism.

• New: The okhttp-zstd module negotiates [Zstandard (zstd)][zstd] compression with servers that
  support it. It integrates a new (unstable) [ZSTD-KMP] library, also from Square. Enable it like
  this:

  val client = OkHttpClient.Builder()
    .addInterceptor(CompressionInterceptor(Zstd, Gzip))
    .build()

• New: Support the QUERY HTTP method. You will need to set the Request.cacheUrlOverride
  property to cache calls made with this method. The RequestBody.sha256() may be helpful here;
  use it to compose a cache URL from the query body.

• New: Publish events when calls must wait to execute. EventListener.dispatcherQueueStart()
  is invoked when a call starts waiting, and dispatcherQueueEnd() is invoked when it's done.

• New: Request.toCurl() returns a copy-pasteable [curl] command consistent with Chrome’s and
  Firefox’s ‘copy as cURL’ features.

• New: Support [JPMS]. We replaced our Automatic-Module-Name metadata with proper
  module-info.java files.

• Fix: Recover gracefully when worker threads are interrupted. When we introduced fast fallback in
  OkHttp 5.0, we started using background threads while connecting. Sadly that code didn't handle
  interruptions well. This is now fixed.

• Upgrade: [Kotlin 2.2.20][kotlin_2_2_20].

• Upgrade: [Okio 3.16.0][okio_3_16_0].

v5.1.0

2025-07-07

• New: Response.peekTrailers(). When we changed Response.trailers() to block instead of
  throwing in 5.0.0, we inadvertently removed the ability for callers to peek the trailers
  (by catching the IllegalStateException if they weren't available). This new API restores that
  capability.

• Fix: Don't crash on trailers() if the response doesn't have a body. We broke [Retrofit] users
  who read the trailers on the raw() OkHttp response, after its body was decoded.

v5.0.0

2025-07-02

This is our first stable release of OkHttp since 2023. Here's the highlights if you're upgrading
from OkHttp 4.x:

OkHttp is now packaged as separate JVM and Android artifacts. This allows us to offer
platform-specific features and optimizations. If your build system handles [Gradle module metadata],
this change should be automatic.

MockWebServer has a new coordinate and package name. We didn’t like that our old artifact
depends on JUnit 4 so the new one doesn’t. It also has a better API built on immutable values. (We
intend to continue publishing the old okhttp3.mockwebserver artifact so there’s no urgency to
migrate.)

OkHttp now supports Happy Eyeballs ([RFC 8305][rfc_8305]) for IPv4+IPv6 networks. It attempts
both IPv6 and IPv4 connections concurrently, keeping whichever connects first.

We’ve improved our Kotlin APIs. You can skip the builder:

val request = Request(
  url = "https://cash.app/".toHttpUrl(),
)

OkHttp now supports [GraalVM].

Here’s what has changed since 5.0.0-alpha.17:

• Upgrade: [Okio 3.15.0][okio_3_15_0].
• Upgrade: [Kotlin 2.2.0][kotlin_2_2_0].
• Fix: Don't crash with a NoSuchMethodError when using OkHttp with the Sentry SDK.
• Fix: Retain the query data in the old okhttp3.mockwebserver.RecordedRequest.path property. We
  inadvertently changed this behavior when we introduced the mockwebserver3 API.