英文:
CORS issue in node server using heroku
问题
我已经为您翻译好了以下内容：
"我已经为几天研究了这个问题，但我不明白为什么在尝试从Heroku上的我的服务器应用程序请求信息时会出现CORS问题。请查看下面的代码以及git存储库的链接。您会看到我在依赖项下的JSON文件中有CORS包。我需要更新node.js或者其他什么吗？这是dynos的问题吗（我几乎不知道dynos是什么，以及是否需要它们用于这个简单的项目）？也许是Procfile或.env的问题？我在.gitignore中有node_modules，但Heroku会自动安装在package-lock.json中找到的依赖关系，对吗？我甚至使用了CLI npm i 来确保。我陷入困境了。任何帮助将不胜感激："
server.js:
// 依赖项
require("dotenv").config();
const express = require('express'); // 服务器框架
const cors = require('cors'); // 跨源资源共享，用于访问外部数据源
// JSON文件
const projects = require("./projects.json");
const about = require("./about.json");
const tutorials = require("./tutorials.json");
// 创建应用程序对象
const app = express();
const PORT = process.env.PORT || 4000;
// 中间件
app.use(cors());
// 路由
// 主页路由，用于API测试
app.get("/", (req, res) => {
res.send("Hello World")
});
// 用于检索项目的路由
app.get("/projects", (req, res) => {
// 以JSON格式发送项目
res.json(projects);
});
// 用于检索关于信息的路由
app.get("/about", (req, res) => {
// 以JSON格式发送关于信息
res.json(about);
});
// 用于检索教程信息的路由
app.get("/tutorials", (req, res) => {
// 以JSON格式发送教程信息
res.json(tutorials);
});
// 监听端口
app.listen(PORT, () => console.log("正在监听端口", PORT));
英文:
I've researched this issue for days and I can't understand why I'm having this CORS issue when trying to request information from my server app on Heroku. See the code below as well as a link to the git repo. You will see I have the CORS package in JSON file under dependencies. Do I need to update node or something? Is it a dynos issue (I barely know what dynos are and if I need them for this simple project)? Maybe a Procfile or .env issue? I have node_modules in .gitignore but Heroku automotaically installs dependecies found in package-lock.json, right? I even used cli npm i just to be sure. I'm stuck. Any help will be absolutely appreciated:
git repo
server.js:
////////////////////
// DEPENDENCIES
///////////////////
require("dotenv").config();
const express = require('express'); //server framework
const cors = require('cors'); //cross origin resource sharing to access data from foreign origins
/////////////////////
// JSON FILES
////////////////////
const projects = require("./projects.json");
const about = require("./about.json");
const tutorials = require("./tutorials.json");
// Create application object
const app = express();
const PORT = process.env.PORT || 4000;
//////////////
// MIDDLEWARE
//////////////
app.use(cors());
//////////////
// ROUTES
//////////////
//home route for api testing
app.get("/", (req, res) =>{
res.send("Hello World")
});
//route for retrieving projectws
app.get("/projects", (req, res)=>{
//send projects via JSON
res.json(projects);
});
//route for retrieving about info
app.get("/about", (req, res) =>{
//send about via JSON
res.json(about);
});
//route for retrieving tutorial info
app.get("/tutorials", (req, res)=>{
//send about via JSON
res.json(tutorials);
});
/////////////
// PORT LISTENER
////////////
app.listen(PORT, () => console.log("They're listening on port", PORT));
答案1
得分: 1
我发现了这个问题。Heroku要求订阅其网络服务，所以服务器应用从未运行。我切换到render.com，现在可以正常运行。
英文:
I found this issue. Heroku requires a subscription for its webservices, so the server application was never running. I switch to render.com and it works fine now.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论