public InputStream getErrorStream() {
            throw new AssertionError("HEAD request should not read error stream");
        }

        @Override
        public Map<String, List<String>> getHeaderFields() {
            return Collections.emptyMap();
        }
    }

    @Test
    public void test_HeadRequestWith200_ReturnsEmptyBody() throws Exception {
        // ## Arrange ##

        when(conn.getHeaderField(0)).thenReturn(statusLine);

        // Mock getHeaderFields to return our headers
        Map<String, List<String>> allHeaders = headers != null ? new HashMap<>(headers) : new HashMap<>();
        allHeaders.put(null, Collections.singletonList(statusLine)); // Status line
        when(conn.getHeaderFields()).thenReturn(allHeaders);

        // Mock individual header access by both string key and index

            entry.setValue(Collections.unmodifiableList((List) entry.getValue()));
        }
        return headerFields = Collections.unmodifiableMap(map);
    }

    @Override
    public Map getHeaderFields() {
        if (headerFields != null) {
            return headerFields;
        }
        try {
            handshake();
        } catch (final IOException ex) {}
        return getHeaderFields0();

        }
        return this.headerFields = Collections.unmodifiableMap(map);
    }

    @Override
    public Map<String, List<String>> getHeaderFields() {
        if (this.headerFields != null) {
            return this.headerFields;
        }
        handshake();
        return getHeaderFields0();
    }

    @Override

import java.net.Proxy
import okhttp3.HttpUrl
import okhttp3.Request

object RequestLine {
  /**
   * Returns the request status line, like "GET / HTTP/1.1". This is exposed to the application by
   * [HttpURLConnection.getHeaderFields], so it needs to be set even if the transport is
   * HTTP/2.
   */
  fun get(
    request: Request,
    proxyType: Proxy.Type,
  ): String =
    buildString {
      append(request.method)

            try {
                response.setEncoding(encoding);
                response.setHttpStatusCode(con.getResponseCode());
                response.setHeaders(con.getHeaderFields());
            } catch (final Exception e) {
                throw new CurlException("Failed to access the response.", e);
            }
            writeContent(() -> {
                try {