}
  }
  return result.readUtf8()
}

/**
 * Returns the canonical address for [address]. If [address] is an IPv6 address that is mapped to an
 * IPv4 address, this returns the IPv4-mapped address. Otherwise, this returns [address].
 *
 * https://en.wikipedia.org/wiki/IPv6#IPv4-mapped_IPv6_addresses
 */
internal fun canonicalizeInetAddress(address: ByteArray): ByteArray {
  return when {

 *  Fix: Recover gracefully when a coalesced connection immediately goes unhealthy.
 *  Fix: Defer the `SecurityException` when looking up the default proxy selector.
 *  Fix: Don't use brackets formatting IPv6 host names in MockWebServer.
 *  Fix: Don't permit cache iterators to remove entries that are being written.


## Version 4.0.1

_2019-07-10_

    assertThat(routeSelector.hasNext()).isTrue()
    val (ipv4_1, ipv4_2) = dns.allocate(2)
    val (ipv6_1, ipv6_2) = dns.allocateIpv6(2)
    dns[uriHost] = listOf(ipv4_1, ipv4_2, ipv6_1, ipv6_2)

    val selection = routeSelector.next()
    assertThat(selection.routes.map { it.socketAddress.address }).containsExactly(
      ipv4_1,
      ipv4_2,
      ipv6_1,
      ipv6_2,
    )
  }

import org.junitpioneer.jupiter.RetryingTest
import org.opentest4j.TestAbortedException

/**
 * This test binds two different web servers (IPv4 and IPv6) to the same port, but on different
 * local IP addresses. Requests made to `127.0.0.1` will reach the IPv4 server, and requests made to
 * `::1` will reach the IPv6 server.
 *
 * By orchestrating two different servers with the same port but different IP addresses, we can

    val request = Request(server1.url("/"))

    server1.enqueue(refusedStream)
    server2.enqueue(bodyResponse)

    dns[server1.hostName] = listOf(ipv6, ipv4)
    socketFactory[ipv6] = server1.inetSocketAddress
    socketFactory[ipv4] = server2.inetSocketAddress

    client =
      client.newBuilder()
        .fastFallback(false)
        .apply {
          retryOnConnectionFailure = false
        }

http://%zz%66%a.com

# If we get an invalid character that has been escaped.
http://%25
http://hello%00

# Escaped numbers should be treated like IP addresses if they are.
# No special handling for IPv4 or IPv4-like URLs
http://%30%78%63%30%2e%30%32%35%30.01  s:http p:/ h:192.168.0.1
http://%30%78%63%30%2e%30%32%35%30.01%2e  s:http p:/ h:0xc0.0250.01.
http://192.168.0.257

    assertThat(localVerifier.verify("\uD83D\uDCA9.com", session)).isFalse()
  }

  @Test fun verifyAsIpAddress() {
    // IPv4
    assertThat("127.0.0.1".canParseAsIpAddress()).isTrue()
    assertThat("1.2.3.4".canParseAsIpAddress()).isTrue()

    // IPv6
    assertThat("::1".canParseAsIpAddress()).isTrue()
    assertThat("2001:db8::1".canParseAsIpAddress()).isTrue()

        .addInterceptor(interceptor1)
        .addInterceptor(interceptor2)
        .build()
    val request1 =
      Request.Builder()
        .url("http://" + TestUtil.UNREACHABLE_ADDRESS_IPV4)
        .build()
    val call = client.newCall(request1)
    val startNanos = System.nanoTime()
    assertFailsWith<SocketTimeoutException> {
      call.execute()
    }

_2022-02-01_

**This release introduces fast fallback to better support mixed IPv4+IPv6 networks.** Fast fallback
is what we're calling our implementation of Happy Eyeballs, [RFC 8305][rfc_8305]. With this
feature OkHttp will attempt both IPv6 and IPv4 connections concurrently, keeping whichever connects
first. Fast fallback gives IPv6 connections a 250 ms head start so IPv6 is preferred on networks
where it's available.

 *  Fix: Change `MockWebServer` to use the same logic as OkHttp when determining
    whether an HTTP request permits a body.
 *  Fix: `HttpUrl` now uses the canonical form for IPv6 addresses.
 *  Fix: Use `HttpUrl` internally.
 *  Fix: Recover from Android 4.2.2 EBADF crashes.
 *  Fix: Don't crash with an `IllegalStateException` if an HTTP/2 or SPDY