**Fault Tolerance**: `FaultTolerantClient` wrapper (retry, circuit breaker), `SwitchableHttpClient` for HTTP client fallback

---

## Key Components

### Core Classes

- **Crawler** (`Crawler.java`): Main orchestrator - `execute()`, `addUrl()`, `cleanup()`, `stop()`

			Optional:    true,
			Type:        "string",
		},
		config.HelpKV{
			Key:         RedirectURI,
			Description: `[DEPRECATED use env 'MINIO_BROWSER_REDIRECT_URL'] Configure custom redirect_uri for OpenID login flow callback` + defaultHelpPostfix(RedirectURI),
			Optional:    true,
			Type:        "string",
		},
		config.HelpKV{
			Key:         config.Comment,
			Description: config.DefaultComment,
			Optional:    true,

          type: Class<T>,
          computeIfAbsent: () -> T,
        ): T = TODO()

        override fun clone(): Call = TODO()
      }
  }

  @Test
  fun callback() {
    val callback =
      object : Callback {
        override fun onFailure(
          call: Call,
          e: IOException,
        ) = TODO()

        override fun onResponse(
          call: Call,

          description: String to specify a shard for searching
          required: false
          schema:
            type: string
            example: abc
        - name: callback
          in: query
          description: Callback name for using JSONP
          required: false
          schema:
            type: string
      responses:
        '200':
          description: Successful operation

import java.util.concurrent.atomic.AtomicInteger;

import jcifs.internal.smb2.rdma.RdmaAccess;
import jcifs.internal.smb2.rdma.RdmaMemoryRegion;

/**
 * TCP memory region implementation.
 *
 * For TCP fallback, memory regions are just wrappers around
 * ByteBuffers since no real RDMA registration is needed.
 */
public class TcpMemoryRegion extends RdmaMemoryRegion {

                    });
                }

                if (qp.code) {
                    delete oauth2.state;
                    oauth2.auth.code = qp.code;
                    oauth2.callback({auth: oauth2.auth, redirectUrl: redirectUrl});
                } else {
                    let oauthErrorMsg;
                    if (qp.error) {
                        oauthErrorMsg = "["+qp.error+"]: " +

      client.newCallWithListener(
        Request
          .Builder()
          .url(server.url("/"))
          .build(),
      )
    val completionLatch = CountDownLatch(1)
    val callback: Callback =
      object : Callback {
        override fun onFailure(
          call: Call,
          e: IOException,
        ) {
          completionLatch.countDown()
        }

        override fun onResponse(

                }
            }
        });
        refresh();
    }

    /**
     * Indexes suggest data from documents.
     *
     * @param success A callback for successful indexing.
     * @param error   A callback for indexing errors.
     */
    public void indexFromDocuments(final Consumer<Boolean> success, final Consumer<Throwable> error) {

      if (System.getProperty("os.name").lowercase().contains("windows")) {
        // windows requires a slightly different approach for some things
      } else {
        buildArgs("--no-fallback")
      }
    }
  }

        public RequestOptionCall<DeleteRequestBuilder> deleteOption() {
            return deleteOption;
        }
    }

    @FunctionalInterface
    public interface RequestOptionCall<OP> {
        void callback(OP op);
    }