我该如何修复（节点：5796）UnhandledPromiseRejectionWarning：错误[ERR_HTTP_HEADERS_SENT]：错误？

Posted 2023-03-10

????????????(??:5796)UnhandledPromiseRejectionWarning:??[ERR_HTTP_HEADERS_SENT]:???

??????:How can i fix (node:5796) UnhandledPromiseRejectionWarning: Error [ERR_HTTP_HEADERS_SENT]: error?

??????:2021-06-02 18:17:23

??????:

?????? node js ????,???????????,?????????????,???????

(node:5796) UnhandledPromiseRejectionWarning: ?? [ERR_HTTP_HEADERS_SENT]: ? ServerResponse.header (C:\Users\Children\ Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\response.js:767:10) ? ServerResponse.send (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\response.js: 170:12) ? ServerResponse.json (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\response.js:267:15) ? C:\Users\Children\Desktop\Web Projects\ Sermon_Tracker\app.js:171:9 ? processTicksAndRejec?(??/??/task_queues.js:97:5)(??:5796)UnhandledPromiseRejectionWarning:????????????????? catch ?????????????,?????? .catch() ???????????? Promise ?????????,??? CLI ?? --unhandled-rejections=strict(??? https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode)? (?? id:1)(??:5796)[DEP0018] DeprecationWarning:????????????????,???? Promise ????????????? Node.js ???

??????????????,????????????????:

app.post('/signup', async (req, res) => 

    // res.json( status: "ok" );

    // const firstName = req.body.firstName;
    // const lastName = req.body.lastName;
    //const username = req.body.email;
    //const password = req.body.password;

    // user = email;

    // const User1 = mongoose.model("User", userSchema);

    // const user2 = new User1(
    //     first_name: firstName,
    //     last_name: lastName,
    //     email: email,
    //     password: password,
    // );

    // user2.save();

    // console.log(user + "Done");

    // res.redirect("/workspace");

    // Hashing passwords

    const  username, password: plainTextPassword  = req.body;

    userN = username;


    if (!username || typeof username !== 'string') 
        return res.json( status: 'error', error: 'Invalid username' );
    

    if (!plainTextPassword || typeof plainTextPassword !== 'string') 
        return res.json( status: 'error', error: 'Invalid password' );
    

    if (plainTextPassword.length < 5) 
        return res.json( status: 'error', error: 'Password too small. Should be atleast 6 characters long.' );
    

    const password = await bcrypt.hash(plainTextPassword, 10);

    try 
        const response = await User.create(
            _id: userN,
            username,
            password
        );
        console.log('user created successfully: ', response);
        res.redirect('/workspace');
     catch (error) 
        if (error.code == 11000) 
            return res.json( status: 'error', error: 'Username already taken' );
        
        throw error
    

    const item1 = new Item(
        _id: userN,
        date: "Date",
        loc: "Location",
        title: "Title",
        passage: "Passage",
        file: "File"
    );

    defaultItems.push(item1);

    res.json( status: 'ok' );

);

????????:

var userN;

var defaultItems = [];

mongoose.connect('mongodb://localhost:27017/sermontracker',
    
        useNewUrlParser: true,
        useUnifiedTopology: true,
        useCreateIndex: true

    
);

const ItemSchema = new mongoose.Schema(
    _id: String,
    date: String,
    loc: String,
    title: String,
    passage: String,
    file: String
);

const Item = mongoose.model("Item", ItemSchema);


app.post("/login", async (req, res) => 

  
    const  username, password  = req.body;

    const user = await User.findOne( username ).lean();

    userN = username;


    if (!user) 
        return res.json( status: 'error', error: 'Invalid username/password' )
    

    if (await bcrypt.compare(password, user.password)) 

        const token = jwt.sign( id: user._id, username: user.username , JWT_SECRET);

        res.redirect('/workspace');

        res.json( status: 'ok', data: token );

    

    res.json( status: 'ok', error: 'Invalid user/password' );


);

app.post('/signup', async (req, res) => 

   
    const  username, password: plainTextPassword  = req.body;

    userN = username;


    if (!username || typeof username !== 'string') 
        return res.json( status: 'error', error: 'Invalid username' );
    

    if (!plainTextPassword || typeof plainTextPassword !== 'string') 
        return res.json( status: 'error', error: 'Invalid password' );
    

    if (plainTextPassword.length < 5) 
        return res.json( status: 'error', error: 'Password too small. Should be atleast 6 characters long.' );
    

    const password = await bcrypt.hash(plainTextPassword, 10);

    try 
        const response = await User.create(
            _id: userN,
            username,
            password
        );
        console.log('user created succecfully: ', response);
        res.redirect('/workspace');
     catch (error) 
        if (error.code == 11000) 
            return res.json( status: 'error', error: 'Username already taken' );
        
        throw error
    

    res.json( status: 'ok' );

    const item1 = new Item(
        _id: userN,
        date: "Date",
        loc: "Location",
        title: "Title",
        passage: "Passage",
        file: "File"
    );

    defaultItems.push(item1);

);

app.get("/", function (req, res) 

    res.render("home");

);

app.get("/change-password", function (req, res) 

    res.render("changepass");

);

app.get("/signup", function (req, res) 

    res.render("signup");

);

app.get("/login", function (req, res) 

    res.render("login");

);

app.get("/workspace", function (req, res) 

    Item.find( _id: userN , function (err, foundItems) 

        if (foundItems.length == 0) 
            Item.insertMany(defaultItems, function (err) 
                if (err) 
                    console.log(err);
                 else 
                    console.log("Added items");
                
            );
            res.redirect("/workspace");

         else 
            res.render("workspace",  itemList: foundItems );
        
    );


);


app.post("/workspace", function (req, res) 

    const date = req.body.input1;
    const location = req.body.input2;
    const title = req.body.input3;
    const passage = req.body.input4;
    const file = req.body.input5;

    const item = new Item(
        _id: userN,
        date: date,
        loc: location,
        title: title,
        passage: passage,
        file: file
    );

    item.save();

    res.redirect("/workspace");
);

??????:

?????1?:

??,userN ????????? (???????,??..) ??????,?????? JSON?????????????????????? JSON? (?????)??????????(????????:))

????:

????????????????userN ?????????????????????????????????

@LublubXT ?????????????????????????????? :)

??,?????,??????????????,??????????

??,??????

???????? throw ???? res.json( status: 'ok' );?