我在我的Express服务器上使用Lucia，这是我的Flutter应用程序的支持。我已经按照文档并在Express中创建了一个注销路由。JavaScript代码按预期工作。

router.post("/signout", async (req, res) => {
  const authRequest = auth.handleRequest(req, res);
  const session = await authRequest.validate(); // or `authRequest.validateBearerToken()`
  console.log(req.headers);
  console.log(req.body);
  if (!session) {
    return res.sendStatus(401);
  }
  await auth.invalidateSession(session.sessionId);
  authRequest.setSession(null);
  return res.status(200).json({
    status: "success",
    message: "User signed out successfully"
  });
});

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当我从Dart调用这个端点时，它总是返回401，但是当使用fetch from JS发出相同的请求时，它正确地返回200并注销用户。注意：当我将此端点更改为GET端点时，dart get请求按预期正常工作，端点返回200。我不知道我做错了什么，这是Dart post请求：

Future<HttpClientResponse> _postWithSession(String endpoint,
      {Map<String, String>? body}) async {
    var cookies = await _getCookies(endpoint);
    if (cookies.isEmpty) {
      throw Exception("Session cookie not found");
    }
    var req = await _client.postUrl(Uri.parse(endpoint));
    req.cookies.addAll(cookies);
    req.headers
        .set(HttpHeaders.contentTypeHeader, "application/json; charset=UTF-8");
    body != null ? req.write(jsonEncode(body)) : req.write(jsonEncode({}));
    var res = await req.close();
    await _updateCookies(endpoint, res.cookies);
    return res;
  }

型
下面是一个成功的请求应该看起来像cURL：

curl "http://localhost:3000/signout" -X POST -H "Origin: http://localhost:3000" -H "Cookie: auth_session=<session_key>"

型