listener.sessionGranted(session);
    } catch (IOException e) {
      return new MockResponse()
          .setResponseCode(400)
          .setBody("code exchange failed: " + e.getMessage());
    }

    synchronized (this) {
      listeners.remove(state);
    }

    // Success!
    return new MockResponse()
        .setResponseCode(302)

 * **Exchange** carries a single HTTP request/response pair.

 * **ExchangeFinder** chooses which connection carries each exchange. Where possible it will use the same connection for all exchanges in a single call. It prefers reusing pooled connections over establishing new connections.      

package okhttp3

import okio.IOException

interface Callback {
  /**
   * Called when the request could not be executed due to cancellation, a connectivity problem or
   * timeout. Because networks can fail during an exchange, it is possible that the remote server
   * accepted the request before the failure.
   */
  fun onFailure(
    call: Call,
    e: IOException,
  )

  /**

import okhttp3.Address
import okhttp3.HttpUrl

/**
 * Policy on choosing which connection to use for an exchange and any retries that follow. This uses
 * the following strategies:
 *
 *  1. If the current call already has a connection that can satisfy the request it is used. Using
 *     the same connection for an initial exchange and its follow-ups may improve locality.
 *

    return connect
  }

  /**
   * Returns the connection already attached to the call if it's eligible for a new exchange.
   *
   * If the call's connection exists and is eligible for another exchange, it is returned. If it
   * exists but cannot be used for another exchange, it is closed and this returns null.
   */
  private fun planReuseCallConnection(): ReusePlan? {

HSPLokhttp3/internal/connection/Exchange$RequestBodySink;-><init>(Lokhttp3/internal/connection/Exchange;Lokio/Sink;J)V
HSPLokhttp3/internal/connection/Exchange$RequestBodySink;->close()V
HSPLokhttp3/internal/connection/Exchange$RequestBodySink;->complete(Ljava/io/IOException;)Ljava/io/IOException;
HSPLokhttp3/internal/connection/Exchange$RequestBodySink;->write(Lokio/Buffer;J)V

 * OAuth, SPNEGO, or other authentication mechanisms. Each authenticator is responsible
 * for obtaining login credentials, resolving user information, and managing SSO
 * lifecycle operations like logout and metadata exchange.
 */
public interface SsoAuthenticator {

    /**
     * Gets the login credential for SSO authentication.
     * @return The login credential.
     */
    LoginCredential getLoginCredential();

    /**

   * provides support.
   */
  QUIC("quic"),

  /**
   * HTTP/3 is the third and upcoming major version of the Hypertext Transfer Protocol used to
   * exchange information. HTTP/3 runs over QUIC, which is published as RFC 9000.
   *
   * HTTP/3 is not natively supported by OkHttp, but provided to allow a theoretical interceptor
   * that provides support.
   */
  HTTP_3("h3"),

    }
  }
  return charset to finalContentType
}

internal fun MediaType?.charsetOrUtf8(): Charset = this?.charset() ?: Charsets.UTF_8

internal val Response.connection: RealConnection
  get() = this.exchange!!.connection

internal fun OkHttpClient.Builder.taskRunnerInternal(taskRunner: TaskRunner) = this.taskRunner(taskRunner)

internal fun buildConnectionPool(
  connectionListener: ConnectionListener,

 * [connection pool][ConnectionPool].
 *
 * Do not confuse this class with the misnamed `HttpURLConnection`, which isn't so much a connection
 * as a single request/response exchange.
 *
 * ## Modern TLS
 *
 * There are trade-offs when selecting which options to include when negotiating a secure connection
 * to a remote host. Newer TLS options are quite useful:
 *