我正在開發一個需要 API 的項目，更準確地說，需要 POST 方法。我讀過關于它的堆棧溢出線程，但它沒有多大幫助：他們只是說使用Access-Control-Allow-Origin盡管我已經這樣做了。所以，這是前端的一面：const CHEMIN_AU_SERVEUR = "http://localhost:3000/api/stuff";const func_that_post_the_card_created = (path, json) => {    const request_projets_post = new XMLHttpRequest();    request_projets_post.open("POST", path, true);    request_projets_post.setRequestHeader("Content-type", "application/x-www-form-urlencoded");    request_projets_post.send(JSON.stringify(json));};func_that_post_the_card_created(CHEMIN_AU_SERVEUR, "title=title&description=description&imageUrl=imageUrl&href=href&github_href=github_href");這里是服務器端server.jsconst http = require('http');const app = require('./app');app.set('port', process.env.PORT || 3000);console.log(process.env.PORT || 3000);const server = http.createServer(app);server.listen(process.env.PORT || 3000);應用程序.jsconst express = require("express");const app = express();const bodyParser = require("body-parser");const ProjectScheme = require("./models/Project");const mongoose = require("mongoose");// The mongoose connect that will not showapp.use((req, res, next) => {  res.setHeader("Access-Control-Allow-Origin", "*");  res.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content, Accept, Content-Type, Authorization");  res.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, PATCH, OPTIONS");  next();});app.use(bodyParser.json());app.post("/api/stuff", (req, res, next) => {  const projet = new ProjectScheme({ ...req.body });  projet.save()    .then(() => res.status(201).json({ message: "Projet enregistré !" }))    .catch((error) => res.status(400).json({ error }));});謝謝你的幫助。這將會非常有幫助。我認為這也會幫助很多其他人。