HTTP/1.1 header parser received no bytes错误排查求助

我一直碰到这个错误，试了各种办法——换JVM、调整代码逻辑，就连ChatGPT都没能给出有效的解决方向。实在找不到头绪了，有没有大佬能帮忙分析下问题出在哪？我真的想搞明白这段代码到底哪里有问题。

以下是我的代码：

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.file.Files;
import java.nio.file.Path;

public class HttpServer {
    private final int port;

    public HttpServer(final int port) {
        this.port = port;
    }

    public void run() {
        try(var serverSocket = new ServerSocket(port)) {
                var socket = serverSocket.accept();
                System.out.println("Socket accepted");
                processSocket(socket);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private void processSocket(Socket socket) throws IOException {
        try(socket;
            var inputStream = new DataInputStream(socket.getInputStream());
            var outputStream = new DataOutputStream(socket.getOutputStream())) {

            System.out.println(new String(inputStream.readNBytes(100)));
            byte[] body = Files.readAllBytes(Path.of("src/main/resources/example.html"));
            outputStream.write("""
                    HTTP/1.1 200 OK
                    content-type: text/html
                    content-length: %s
                    """.formatted(body.length).getBytes());
            outputStream.write(System.lineSeparator().getBytes());
            outputStream.write(body);

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.nio.file.Path;
import java.util.concurrent.ExecutionException;

import static java.net.http.HttpRequest.BodyPublishers.ofFile;

public class HttpClientRunner {
    public static void main(final String[] args) throws IOException, InterruptedException, ExecutionException {
        var httpClient = HttpClient.newBuilder()
                .version(HttpClient.Version.HTTP_1_1)
                .build();
        var request = HttpRequest.newBuilder()
                .uri(URI.create("http://localhost:8082"))
                .header("content-type", "application/json")
                .POST(ofFile(Path.of("src/main/resources/example.json")))
                .build();

        var response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());

        System.out.println(response.headers());
        System.out.println(response.body());
    }
}

我已经搜遍了各种资料，完全找不到能解决这个问题的相关内容，实在是没办法了。

备注：内容来源于stack exchange，提问作者Lem