*   <li>{@code done} - Flag indicating whether the file has been retrieved.</li>
 * </ul>
 *
 * <p>Constructors:</p>
 * <ul>
 *   <li>{@code ContentOutputStream(int threshold, File tmpDir)} - Constructs a ContentOutputStream with a specified threshold and temporary directory.</li>
 * </ul>
 *
 * <p>Methods:</p>
 * <ul>
 *   <li>{@code getFile()} - Marks the file as retrieved and returns the file.</li>

- `org.codelibs.curl.CurlResponse`: wrapper for HTTP responses.
- `org.codelibs.curl.CurlException`: unchecked exception for errors.
- `org.codelibs.curl.io.ContentCache` and `ContentOutputStream`: internal utilities for streaming and caching.

Refer to the Javadoc for full API details.

## Building and Testing

```bash
git clone https://github.com/codelibs/curl4j.git
cd curl4j
mvn clean test

import java.net.URL;
import java.util.Arrays;
import java.util.Objects;
import java.util.function.Consumer;
import java.util.logging.Logger;

import static org.codelibs.curl.io.ContentOutputStream.PREFIX;
import static org.codelibs.curl.io.ContentOutputStream.SUFFIX;
import static org.junit.Assert.assertEquals;

public class IOIntegrationTest {

    private static final Logger logger = Logger.getLogger(IOIntegrationTest.class.getName());

### I/O Layer

- **`org.codelibs.curl.io.ContentCache`**: Handles automatic in-memory or on-disk caching of request/response bodies
- **`org.codelibs.curl.io.ContentOutputStream`**: Streaming utilities for efficient content handling

### Key Design Patterns

1. **Fluent Builder Pattern**: `CurlRequest` uses method chaining for configuration