*   <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>

        ContentOutputStream cos = new ContentOutputStream(10, Curl.tmpDir);
        cos.write(new byte[] { 0, 1, 2, 3, 4 });
        assertFalse(cos.done);
        assertTrue(cos.isInMemory());
        cos.close();
        assertFalse(cos.done);
    }

    @Test
    public void inFile() throws IOException {
        ContentOutputStream cos = new ContentOutputStream(10, Curl.tmpDir);

- `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

### 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

         */
        private void writeContent(final Supplier<InputStream> handler) {
            try (BufferedInputStream bis = new BufferedInputStream(handler.get());
                    ContentOutputStream dfos = new ContentOutputStream(threshold, Curl.tmpDir)) {
                final byte[] bytes = new byte[4096];
                int length = bis.read(bytes);
                while (length != -1) {
                    if (length != 0) {