}

    @Test
    @DisplayName("Should get all addresses by name")
    void testGetAllByName() throws UnknownHostException {
        // When
        Address[] addresses = nameServiceClient.getAllByName("localhost", false);

        // Then
        assertNotNull(addresses, "Should return addresses array");
        assertTrue(addresses.length > 0, "Should return at least one address");
    }

    @Test

    /**
     * Resolves the given host name to an array of IP addresses.
     * The host name is first converted to ASCII using IDN before resolution.
     * IPv6 addresses in bracket notation (e.g., [::1] or [2001:db8::1]) are
     * handled specially by removing the brackets before resolution.
     *
     * @param host the host name to resolve
     * @return an array of IP addresses for the host

They're also concrete: each URL identifies a specific path (like `/square/okhttp`) and query (like `?q=sharks&lang=en`). Each webserver hosts many URLs.

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

Addresses specify a webserver (like `github.com`) and all of the **static** configuration necessary to connect to that server: the port number, HTTPS settings, and preferred network protocols (like HTTP/2).

    val result = proxies[nextProxyIndex++]
    resetNextInetSocketAddress(result)
    return result
  }

  /** Prepares the socket addresses to attempt for the current proxy or host. */
  @Throws(IOException::class)
  private fun resetNextInetSocketAddress(proxy: Proxy) {
    // Clear the addresses. Necessary if getAllByName() below throws!
    val mutableInetSocketAddresses = mutableListOf<InetSocketAddress>()

    }

    /**
     * Gets the list of new IP addresses.
     *
     * @return the new IP addresses
     */
    public List<WitnessIPAddress> getNewIPAddresses() {
        return newIPAddresses;
    }

    /**
     * Gets the list of old IP addresses.
     *
     * @return the old IP addresses
     */
    public List<WitnessIPAddress> getOldIPAddresses() {

     * fallbacks to prevent the host machine's various IP addresses from interfering.
     */
    private val SINGLE_INET_ADDRESS_DNS =
      Dns { hostname ->
        val addresses = Dns.SYSTEM.lookup(hostname)
        listOf(addresses[0])
      }

    private operator fun Throwable?.plus(throwable: Throwable): Throwable {
      if (this != null) {

			// the 'for=' capture, which we ignore. In the case of multiple IP
			// addresses (for=8.8.8.8, 8.8.4.4, 172.16.1.20 is valid) we only
			// extract the first, which should be the client IP.
			if match := forRegex.FindStringSubmatch(fwd); len(match) > 1 {
				// IPv6 addresses in Forwarded headers are quoted-strings. We strip
				// these quotes.
				addr = strings.Trim(match[1], `"`)
			}
		}

import okio.Buffer

/**
 * Quick and dirty pattern to differentiate IP addresses from hostnames. This is an approximation
 * of Android's private InetAddress#isNumeric API.
 *
 * This matches IPv6 addresses as a hex string containing at least one colon, and possibly
 * including dots after the first colon. It matches IPv4 addresses as strings containing only

        assertEquals(0, stats.getActiveSessions());
        assertEquals(0, stats.getTotalChannels());
    }

    @Test
    @DisplayName("createChannelTransport should fail with null addresses")
    void testCreateChannelTransportWithNullAddresses() {
        // Use reflection to access private method for testing
        Exception exception = assertThrows(Exception.class, () -> {

// Addr2line is a minimal simulation of the GNU addr2line tool,
// just enough to support pprof.
//
// Usage:
//
//	go tool addr2line binary
//
// Addr2line reads hexadecimal addresses, one per line and with optional 0x prefix,
// from standard input. For each input address, addr2line prints two output lines,
// first the name of the function containing the address and second the file:line