Question

您好我有以下方法，我无法确定我收到此错误的原因

错误：发送后无法设置标头。在ServerResponse.OutgoingMessage.setHeader（_http_outgoing.js：335：11）在ServerResponse.header（/home/kwanso/Projects/myApp/Server/node_modules/express/lib/response.js:718:10）在ServerResponse.json（/home/kwanso/Projects/myApp/Server/node_modules/express/lib/response.js:246:10）在/home/kwanso/Projects/myApp/Server/app.js:92:11 在Layer.handle [as handle_request]（/home/kwanso/Projects/myApp/Server/node_modules/express/lib/router/layer.js:95:5）在下一个（/home/kwanso/Projects/myApp/Server/node_modules/express/lib/router/route.js:131:13）完成后（/home/kwanso/Projects/myApp/Server/node_modules/passport/lib/middleware/authenticate.js:243:13） at /home/kwanso/Projects/myApp/Server/node_modules/passport/lib/middleware/authenticate.js:250:15 通过（/home/kwanso/Projects/myApp/Server/node_modules/passport/lib/authenticator.js:421:14）在Authenticator.transformAuthInfo（/home/kwanso/Projects/myApp/Server/node_modules/passport/lib/authenticator.js:443:5） at /home/kwanso/Projects/myApp/Server/node_modules/passport/lib/middleware/authenticate.js:247:22 at /home/kwanso/Projects/myApp/Server/node_modules/passport/lib/http/request.js:58:7 通过（/home/kwanso/Projects/myApp/Server/node_modules/passport/lib/authenticator.js:267:43）在序列化（/home/kwanso/Projects/myApp/Server/node_modules/passport/lib/authenticator.js:276:7）在/home/kwanso/Projects/myApp/Server/app.js:97:3 通过（/home/kwanso/Projects/myApp/Server/node_modules/passport/lib/authenticator.js:284:9） - 来自/home/kwanso/Projects/myApp/Server/node_modules/express/lib/application.js:629:43（功能 EventEmitter.logerror）

我的方法如下：

passport.use(new LocalStrategy(
      function(username, password, done) {
        console.log("New Local Strategy");
        User.find({ email: username }, function (err, user) {
          console.log(user[0]._doc);
          if (err) { return done(err); }
          if (!user) { return done(null, false); }
          if (user[0]._doc.password != password) { return done(null, false); }
          console.log("sending");
          return done(null, user);
          console.log("sendt");
        });
        return done(null , false);
      }
    ));

    var isValidPassword = function(user, password){
      return true;
    }

    app.post('/login',
    passport.authenticate('local') ,
    function(req, res) {
      console.log("Back");
          res.send(req.user[0]);
    });

    passport.serializeUser(function(user, done) {
      console.log("Serialize User");
      done(null, user);
    });

    passport.deserializeUser(function(user, done) {
      console.log("De Serialize User");
      done(null, user);
    });

这似乎与在回调中的回调方法中调用res.send有关。这是一个问题吗？

Answer 1

你在LocalStrategy Twice中调用完成回调

一旦在函数结束时（用户名，密码，已完成）{

  if (err) { return done(err); }
  if (!user) { return done(null, false); }
  if (user[0]._doc.password != password) { return done(null, false); }
  console.log("sending");
  return done(null, user);

和从数据库中提取用户后的一次

  return done(null , false);

只需删除最后一行即可获得

var out_width =  $(window).width();

res.send发送后无法设置标头

1 个答案: