[jetty_8_252]: https://webtide.com/jetty-alpn-java-8u252/
 [kotlin_1_3_71]: https://github.com/JetBrains/kotlin/releases/tag/v1.3.71
 [kotlin_1_4_10]: https://github.com/JetBrains/kotlin/releases/tag/v1.4.10
 [kotlin_1_6_20]: https://github.com/JetBrains/kotlin/releases/tag/v1.6.20
 [kotlin_1_8_21]: https://github.com/JetBrains/kotlin/releases/tag/v1.8.21
 [legacy_interceptor]: https://gist.github.com/swankjesse/80135f4e03629527e723ab3bcf64be0b

   * OkHttp in the current runtime. Use this to include the OkHttp version in custom `User-Agent`
   * headers.
   *
   * Official OkHttp releases follow [semantic versioning][semver]. Versions with the `-SNAPSHOT`
   * qualifier are not unique and should only be used in development environments. If you create

 *
 * @constructor Create a new connection pool with tuning parameters appropriate for a single-user
 * application. The tuning parameters in this pool are subject to change in future OkHttp releases.
 * Currently this pool holds up to 5 idle connections which will be evicted after 5 minutes of
 * inactivity.
 */
class ConnectionPool internal constructor(
  internal val delegate: RealConnectionPool,
) {

![Events Diagram](../assets/images/******@****.***)

### Availability

 * [application interceptor][OkHttpClient.interceptors] or as a [OkHttpClient.networkInterceptors].
 *
 * The format of the logs created by this class should not be considered stable and may
 * change slightly between releases. If you need a stable logging format, use your own interceptor.
 */
class HttpLoggingInterceptor
  @JvmOverloads
  constructor(
    private val logger: Logger = Logger.DEFAULT,
  ) : Interceptor {

    connection.lock.assertHeld()

    check(this.connection == null)
    this.connection = connection
    connection.calls.add(CallReference(this, callStackTrace))
  }

  /**
   * Releases resources held with the request or response of [exchange]. This should be called when
   * the request completes normally or when it fails due to an exception, in which case [e] should
   * be non-null.
   *

[kotlin_1_4_20]: https://github.com/JetBrains/kotlin/releases/tag/v1.4.20
[kotlin_1_5_31]: https://github.com/JetBrains/kotlin/releases/tag/v1.5.31
[kotlin_1_6_10]: https://github.com/JetBrains/kotlin/releases/tag/v1.6.10
[kotlin_1_6_21]: https://github.com/JetBrains/kotlin/releases/tag/v1.6.21
[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

| Version | Supported           | Notes                                        |
| ------- | ------------------- | -------------------------------------------- |
| 5.x     | ✅                  | APIs subject to change in alpha releases.    |
| 4.x     | ✅                  | Android 5.0+ (API level 21+) and on Java 8+. |
| 3.x     | ❌ Ended 2021-12-31 | Android 2.3+ (API level 9+) and Java 7+.     |


## Reporting a Vulnerability

 * [event listener factory][OkHttpClient.eventListenerFactory].
 *
 * The format of the logs created by this class should not be considered stable and may change
 * slightly between releases. If you need a stable logging format, use your own event listener.
 */
class LoggingEventListener private constructor(
  private val logger: HttpLoggingInterceptor.Logger,
) : EventListener() {

```

The OkHttp `3.12.x` branch supports Android 2.3+ (API level 9+) and Java 7+. These platforms lack
support for TLS 1.2 and should not be used.


Releases
--------

Our [change log][changelog] has release history.

The latest release is available on [Maven Central](https://search.maven.org/artifact/com.squareup.okhttp3/okhttp/4.12.0/jar).

```kotlin
implementation("com.squareup.okhttp3:okhttp:4.12.0")
```