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 frameworkconst 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 objectconst app = express();const PORT = process.env.PORT || 4000;//////////////// MIDDLEWARE//////////////app.use(cors());//////////////// ROUTES////////////////home route for api testingapp.get("/", (req, res) =>{res.send("Hello World")});//route for retrieving projectwsapp.get("/projects", (req, res)=>{//send projects via JSONres.json(projects);});//route for retrieving about infoapp.get("/about", (req, res) =>{//send about via JSONres.json(about);});//route for retrieving tutorial infoapp.get("/tutorials", (req, res)=>{//send about via JSONres.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.
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