[okio.FileSystem]: https://square.github.io/okio/file_system/
 [okio_2_6_0]: https://square.github.io/okio/changelog/#version-260
 [okio_2_7_0]: https://square.github.io/okio/changelog/#version-270
 [okio_3_0_0]: https://square.github.io/okio/changelog/#version-300
 [okio_3_2_0]: https://square.github.io/okio/changelog/#version-320
 [okio_3_6_0]: https://square.github.io/okio/changelog/#version-360

      }
    ```

 [CustomTrustJava]: https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/CustomTrust.java
 [CustomTrustKotlin]: https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/kt/CustomTrust.kt
 [CertificatePinningJava]: https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/CertificatePinning.java

    assertThat("https://127.0.0.1".toHttpUrl().topPrivateDomain()).isNull()

    // https://github.com/square/okhttp/issues/6109
    assertThat("http://a./".toHttpUrl().topPrivateDomain()).isNull()
    assertThat("http://squareup.com./".toHttpUrl().topPrivateDomain())
      .isEqualTo("squareup.com")
  }

  @Test
  fun fragmentNonAscii() {
    val url = "http://host/#Σ".toHttpUrl()

    assertThat(publicSuffixDatabase.getEffectiveTldPlusOne("foo.bar.square.com"))
      .isEqualTo("bar.square.com")
    assertThat(publicSuffixDatabase.getEffectiveTldPlusOne("foo.my.square.com"))
      .isEqualTo("foo.my.square.com")
  }

  @Test fun wildcardMatch() {
    val buffer =
      Buffer()
        .writeUtf8("*.square.com\n")
        .writeUtf8("com\n")
        .writeUtf8("example.com\n")

## Verifying Artifacts

We sign our artifacts using this [key][signing_key]:

```
pub rsa4096/dbd744ace7ade6aa50dd591f66b50994442d2d40 2021-07-09T14:50:19Z
	 Hash=a79b48fd6a1f31699c788b50c97d0b98

uid Square Clippy <opensource@squareup.com>
sig  sig  66b50994442d2d40 2021-07-09T14:50:19Z 2041-07-04T14:50:19Z ____________________ [selfsig]
```

The best way to verify artifacts is [automatically with Gradle][gradle_verification].

### EventListener

Subclass [EventListener](https://square.github.io/okhttp/3.x/okhttp/okhttp3/EventListener.html) and override methods for the events you are interested in. In a successful HTTP call with no redirects or retries the sequence of events is described by this flow.

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

 [okhttp]: https://square.github.io/okhttp/
 [okio]: https://github.com/square/okio
 [post_example]: https://raw.github.com/square/okhttp/master/samples/guide/src/main/java/okhttp3/guide/PostExample.java
 [r8_proguard]: https://square.github.io/okhttp/features/r8_proguard/
 [recipes]: https://square.github.io/okhttp/recipes/
 [snap]: https://s01.oss.sonatype.org/content/repositories/snapshots/

 [concurrency]: https://square.github.io/okhttp/concurrency/
 [debug_logging]: https://square.github.io/okhttp/debug_logging/
 [releasing]: https://square.github.io/okhttp/releasing/
 [security]: https://square.github.io/okhttp/security/
 [works_with_okhttp]: https://square.github.io/okhttp/works_with_okhttp/

 [concurrency]: https://square.github.io/okhttp/concurrency/
 [debug_logging]: https://square.github.io/okhttp/debug_logging/
 [releasing]: https://square.github.io/okhttp/releasing/
 [security]: https://square.github.io/okhttp/security/
 [works_with_okhttp]: https://square.github.io/okhttp/works_with_okhttp/

 * When making TLS connections with multiple [connection specs](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-connection-spec/), these are attempted in sequence until the TLS handshake succeeds.

### [Connections](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-connection/)