以上述方式挂载子应用时，FastAPI 使用 ASGI 规范中的 `root_path` 机制处理挂载子应用路径之间的通信。

这样，子应用就可以为自动文档使用路径前缀。

并且子应用还可以再挂载子应用，一切都会正常运行，FastAPI 可以自动处理所有 `root_path`。

	public final fun -deprecated_proxy ()Ljava/net/Proxy;
	public final fun -deprecated_socketAddress ()Ljava/net/InetSocketAddress;
	public fun <init> (Lokhttp3/Address;Ljava/net/Proxy;Ljava/net/InetSocketAddress;)V
	public final fun address ()Lokhttp3/Address;
	public fun equals (Ljava/lang/Object;)Z
	public fun hashCode ()I
	public final fun proxy ()Ljava/net/Proxy;
	public final fun requiresTunnel ()Z

	MessageWriter io.Writer

	// XdsViaAgents accesses Istiod via the tap service of each agent.
	// This is only used in `proxy-status` command.
	XdsViaAgents bool

	// XdsViaAgentsLimit is the maximum number of pods being visited by istioctl,
	// when `XdsViaAgents` is true. This is only used in `proxy-status` command.
	// 0 means that there is no limit.
	XdsViaAgentsLimit int
}

var DefaultOptions = Options{

    return Primitives.wrap(type).cast(generateFresh(TypeToken.of(type)));
  }

  final <T> T newFreshProxy(final Class<T> interfaceType) {
    T proxy = newProxy(interfaceType);
    freshness.incrementAndGet();
    return proxy;
  }

  /**
   * Generates an instance for {@code type} using the current {@link #freshness}. The generated
   * instance may or may not be unique across different calls.

Istio Version:       1.21.0-1226
Istio Proxy Version: ee85c5f28702f00621aed895915fca565796b9e4
Envoy Version:       0.0.0

NAME                                                                SERVICE FQDN                          PORT     SUBSET     DIRECTION       TYPE       DESTINATION RULE
cluster/agent                                                       cluster/agent                         -        -          -               STATIC     

 * [newFixedLengthSource(0)][newFixedLengthSource] and may skip reading and closing that source.
 */
class Http1ExchangeCodec(
  /** The client that configures this stream. May be null for HTTPS proxy tunnels. */
  private val client: OkHttpClient?,
  override val carrier: ExchangeCodec.Carrier,
  private val source: BufferedSource,
  private val sink: BufferedSink,
) : ExchangeCodec {
  private var state = STATE_IDLE

/**
 * A denylist of failed routes to avoid when creating a new connection to a target address. This is
 * used so that OkHttp can learn from its mistakes: if there was a failure attempting to connect to
 * a specific IP address or proxy server, that failure is remembered and alternate routes are
 * preferred.
 */
class RouteDatabase {
  private val _failedRoutes = mutableSetOf<Route>()

  val failedRoutes: Set<Route>

```
INFO: Sending request http://www.publicobject.com/helloworld.txt on Connection{www.publicobject.com:80, proxy=DIRECT hostAddress=54.187.32.157 cipherSuite=none protocol=http/1.1}
User-Agent: OkHttp Example
Host: www.publicobject.com
Connection: Keep-Alive
Accept-Encoding: gzip

👈 🌌, 🎧-🈸 🔜 💭 ⚙️ 👈 ➡ 🔡 🩺 🎚.

& 🎧-🈸 💪 ✔️ 🚮 👍 📌 🎧-🈸 & 🌐 🔜 👷 ☑, ↩️ FastAPI 🍵 🌐 👉 `root_path`Ⓜ 🔁.

  }

  @Test
  fun requestToStringRedactsSensitiveHeaders() {
    val headers =
      Headers.Builder()
        .add("content-length", "99")
        .add("authorization", "peanutbutter")
        .add("proxy-authorization", "chocolate")
        .add("cookie", "drink=coffee")
        .add("set-cookie", "accessory=sugar")
        .add("user-agent", "OkHttp")
        .build()
    val request =
      Request(