*/
  @Throws(IOException::class)
  fun processNextEvent(): Boolean {
    var id = lastId
    var type: String? = null
    val data = Buffer()

    while (true) {
      when (source.select(options)) {
        in 0..2 -> {
          completeEvent(id, type, data)
          return true
        }

        in 3..4 -> {
          source.readData(data)
        }

        in 5..7 -> {

    skipWhitespace()
    val type = select(optionsType)

    when (type) {
      TYPE_DEVIATION, TYPE_MAPPED, TYPE_DISALLOWED_STD3_MAPPED -> {
        skipWhitespace()
        if (readByte() != ';'.code.toByte()) throw IOException("expected ';'")

        // Like "0061" or "0031 2044 0034".
        while (true) {
          skipWhitespace()

          when (select(optionsDelimiter)) {

class FakeProxySelector : ProxySelector() {
  val proxies: MutableList<Proxy> = mutableListOf()

  fun addProxy(proxy: Proxy): FakeProxySelector {
    proxies.add(proxy)
    return this
  }

  override fun select(uri: URI): List<Proxy> {
    // Don't handle 'socket' schemes, which the RI's Socket class may request (for SOCKS).
    return if (uri.scheme == "http" || uri.scheme == "https") proxies else listOf(Proxy.NO_PROXY)
  }

    )
    server.enqueue(
      MockResponse(code = 407),
    )
    client =
      client.newBuilder()
        .proxySelector(
          object : ProxySelector() {
            override fun select(uri: URI): List<Proxy> = listOf(server.toProxyAddress())

            override fun connectFailed(
              uri: URI,
              socketAddress: SocketAddress,
              e: IOException,

class RecordingProxySelector : ProxySelector() {
  @JvmField val proxies = mutableListOf<Proxy>()

  private val requestedUris = mutableListOf<URI>()
  private val failures = mutableListOf<String>()

  override fun select(uri: URI): List<Proxy> {
    requestedUris.add(uri)
    return proxies
  }

  fun assertRequests(vararg expectedUris: URI?) {
    assertThat(requestedUris).containsExactly(*expectedUris)
    requestedUris.clear()

import java.net.ProxySelector
import java.net.SocketAddress
import java.net.URI

/**
 * A proxy selector that always returns the [Proxy.NO_PROXY].
 */
object NullProxySelector : ProxySelector() {
  override fun select(uri: URI?): List<Proxy> {
    requireNotNull(uri) { "uri must not be null" }
    return listOf(Proxy.NO_PROXY)
  }

  override fun connectFailed(
    uri: URI?,
    sa: SocketAddress?,
    ioe: IOException?,

...
BUILD SUCCESSFUL in 1m 30s
63 actionable tasks: 61 executed, 2 up-to-date

```

[Moshi](https://github.com/square/moshi) is a handy API for converting between JSON and Java objects. Here we're using it to decode a JSON response from a GitHub API.

Note that `ResponseBody.charStream()` uses the `Content-Type` response header to select which charset to use when decoding the response body. It defaults to `UTF-8` if no charset is specified.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

    proxySelector.assertRequests() // No proxy selector requests!
  }

  @Test fun proxySelectorReturnsNull() {
    val nullProxySelector: ProxySelector =
      object : ProxySelector() {
        override fun select(uri: URI): List<Proxy>? {
          assertThat(uri.host).isEqualTo(uriHost)
          return null
        }

        override fun connectFailed(
          uri: URI,
          socketAddress: SocketAddress,

  }

  @Test
  fun proxySelector() {
    server.enqueue(MockResponse.Builder().body("abc").build())
    val proxySelector: ProxySelector =
      object : ProxySelector() {
        override fun select(uri: URI) = listOf(socksProxy.proxy())

        override fun connectFailed(
          uri: URI,
          socketAddress: SocketAddress,
          e: IOException,
        ) = error("unexpected call")
      }