// Setting onConnect to null should work
        request.onConnect(null);

        assertNotNull(request);
    }

    @Test
    public void testMultipleOnConnectCalls() {
        CurlRequest request = new CurlRequest(Method.GET, "https://example.com");

        // Multiple onConnect calls should work (last one wins)
        request.onConnect((req, conn) -> conn.setConnectTimeout(1000));

            mockHolder[0] = mock;
            return mock;
        });
        req.timeout(3000, 5000);
        // onConnect runs AFTER timeout, so it can override
        req.onConnect((r, conn) -> {
            conn.setReadTimeout(9999);
            onConnectReadTimeout.set(conn.getReadTimeout());
        });

        // ## Act ##

      }

      OverrideParam.ConnectTimeout -> {
        client =
          client
            .newBuilder()
            .socketFactory(
              DelayingSocketFactory(onConnect = { timeout ->
                if (timeout == 10) {
                  throw IOException()
                }
              }),
            ).build()

            } else if (entry.getValue().length == 1) {
                curlRequest.param(entry.getKey(), entry.getValue()[0]);
            }
        });
        try (final CurlResponse curlResponse = curlRequest.onConnect((req, con) -> {
            con.setDoOutput(true);
            if (httpMethod != Method.GET && request.getContentLength() > 2) {

    /**
     * Sets the connection builder for customizing the connection.
     *
     * @param connectionBuilder the connection builder
     * @return this CurlRequest instance
     */
    public CurlRequest onConnect(final BiConsumer<CurlRequest, HttpURLConnection> connectionBuilder) {
        this.connectionBuilder = connectionBuilder;
        return this;
    }

    /**
     * Adds a request parameter.
     *

	}

	var message message
	_, _, err = message.parse(msg)
	if err != nil {
		writeErr(fmt.Errorf("error parsing grid connect: %w", err))
		return
	}
	if message.Op != OpConnect {
		writeErr(fmt.Errorf("unexpected connect op: %v", message.Op))
		return
	}
	var cReq connectReq
	_, err = cReq.UnmarshalMsg(message.Payload)
	if err != nil {

			}
			c.updateState(StateConnectionError)
			time.Sleep(sleep)
		}
		if err != nil {
			retry(err)
			continue
		}
		// Send connect message.
		m := message{
			Op: OpConnect,
		}
		req := connectReq{
			Host: c.Local,
			ID:   c.id,
			Time: time.Now(),
		}
		req.addToken(c.authFn)
		err = c.sendMsg(conn, m, &req)
		if err != nil {
			retry(err)
			continue