apache httpclient 如何支持br解码

要让 Apache HttpClient 支持 BR（Brotli）压缩算法的解码，需要进行以下步骤：

1. 添加 BrotliDecoder 类的引用：

import org.apache.http.client.entity.BrotliInputStream;

2. 创建 HttpClient 对象时，注册 Brotli 相关的解码器：

BrotliDecoder brotliDecoder = new BrotliDecoder();
HttpClient httpClient = HttpClientBuilder.create()
        .setContentDecoderRegistry(
                RegistryBuilder.<InputStreamFactory>create()
                        .register("br", new BrotliInputStreamFactory(brotliDecoder))
                        .build())
        .build();

3. 定义一个 BrotliInputStreamFactory 类，用于创建 BrotliInputStream：

public class BrotliInputStreamFactory implements InputStreamFactory {
    private final BrotliDecoder brotliDecoder;

    public BrotliInputStreamFactory(BrotliDecoder brotliDecoder) {
        this.brotliDecoder = brotliDecoder;
    }

    @Override
    public InputStream create(InputStream inputStream) throws IOException {
        return new BrotliInputStream(inputStream, brotliDecoder);
    }
}

完成以上步骤后，HttpClient 就可以自动识别并解码 BR 压缩的响应了。