React-Heroku Postgress-Addon：GET http://app-name.herokuapp.com/any 503（服务不可用）

Posted 2023-03-08

【中文标题】React-Heroku Postgress-Addon：GET http://app-name.herokuapp.com/any 503（服务不可用）

【英文标题】：React-Heroku Postgress-Addon: GET http://app-name.herokuapp.com/any 503 (Service Unavailable)

【发布时间】：2021-05-21 03:28:38

【问题描述】：

我正在尝试将 CRUD 待办事项列表应用程序部署到 Heroku。我正在使用来自 heroku 的 React、NodeJS 和 Postgress 插件。在部署过程中我没有收到任何错误，但是前端似乎没有与后端连接。当我尝试添加新的“待办事项”时，我收到下一条消息（应用程序也无法从数据库中获取条目）：

index.js

const express = require("express");
const app = express();
const cors = require("cors");
const pool = require("./db");
const path = require("path");
const PORT = process.env.PORT || 5000;

//middleware
app.use(cors());
app.use(express.json()); // => allows us to access the req.body


if (process.env.NODE_ENV === "production") 
  //server static content
  //npm run build
  app.use(express.static(path.join(__dirname, "client/build")));


console.log(__dirname);
console.log(path.join(__dirname, "client/build"));

//ROUTES//
//get all Todos
app.get("/todos", async (req, res) => 
  try 
    const allTodos = await pool.query("SELECT * FROM todo");

    res.json(allTodos.rows);
   catch (err) 
    console.error(err.message);
  
);

//get a todo
app.get("/todos/:id", async (req, res) => 
  try 
    const  id  = req.params;
    const todo = await pool.query("SELECT * FROM todo WHERE todo_id = $1", [
      id,
    ]);
    res.json(todo.rows[0]);
   catch (err) 
    console.error(err.message);
  
);

//create a todo
app.post("/todos", async (req, res) => 
  try 
    console.log(req.body);
    const  description  = req.body;
    const newTodo = await pool.query(
      "INSERT INTO todo (description) VALUES ($1) RETURNING *",
      [description]
    );

    res.json(newTodo.rows[0]);
   catch (err) 
    console.error(err.message);
  
);

//update a todo
app.put("/todos/:id", async (req, res) => 
  try 
    const  id  = req.params;
    const  description  = req.body;
    const updateTodo = await pool.query(
      "UPDATE todo SET description = $1 WHERE todo_id = $2",
      [description, id]
    );

    res.json("Todo was updated");
   catch (err) 
    console.error(err.message);
  
);

//delete a todo
app.delete("/todos/:id", async (req, res) => 
  try 
    const  id  = req.params;
    const deleteTodo = await pool.query("DELETE FROM todo WHERE todo_id = $1", [
      id,
    ]);
    res.json("Todo was deleted");
   catch (err) 
    console.error(err.message);
  
);

app.get("*", (req, res) => 
  res.sendFile(path.join(__dirname, "client/build/index.html"));
);

app.listen(PORT, () => 
  console.log(`Server is starting on port $PORT`);
);

db.js

const Pool = require("pg").Pool;
require("dotenv").config();

const devConfig = `postgresql://$process.env.PG_USER:$process.env.PG_PASSWORD@$process.env.PG_HOST:$process.env.PG_PORT/$process.env.PG_DATABASE`;

const proConfig = process.env.DATABASE_URL; //heroku addons

const pool = new Pool(
  connectionString:
    process.env.NODE_ENV === "production" ? proConfig : devConfig,
);

module.exports = pool;

package.json（根目录）

  "name": "server",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "engines": 
    "node": "10.14.2",
    "npm": "6.14.2"
  ,
  "scripts": 
    "start": "node index.js",
    "heroku-postbuild": "cd client && npm install && npm run build"
  ,
  "author": "henry",
  "license": "ISC",
  "dependencies": 
    "cors": "^2.8.5",
    "dotenv": "^8.2.0",
    "express": "^4.17.1",
    "pg": "^7.18.2"
  

package.json（客户端）

  "name": "client",
  "version": "0.1.0",
  "private": true,
  "dependencies": 
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.3.2",
    "@testing-library/user-event": "^7.1.2",
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-scripts": "3.4.0"
  ,
  "scripts": 
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  ,
  "eslintConfig": 
    "extends": "react-app"
  ,
  "browserslist": 
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  ,
  "proxy": "http://localhost:5000"

我正在使用以下 git 存储库中的代码：https://github.com/l0609890/pern-deploy-tutorial。 并按照下面的说明（我认为您可以将视频跳到最少 34:00）：https://www.youtube.com/watch?v=ZJxUOOND5_A

非常感谢！

【问题讨论】：

2021-02-18T06:34:45.692018+00:00 app[web.1]: description: 'hi' 2021-02-18T06:34:45.927723+00:00 app[web.1]: no pg_hba.conf entry for host "35.175.243.252", user "arkqcuvolsgwnz", database "d2l3k93rvhp242", SSL off 2021-02-18T06:34:51.137702+00:00 heroku[router]: at=error code=H12 desc="Request timeout" method=POST path="/todos" host=todo-app-pern-stack.herokuapp.com request_id=caf16648-4ee5-444a-85f1-f845c183885e fwd="104.185.38.51" dyno=web.1 connect=2ms service=30001ms status=503 bytes=0 protocol=https

【参考方案1】：

由于 Heroku 使用 Heroku 管理的负载均衡器，因此超时设置为 30 秒。

如果在 catch 块中出现错误，您似乎还没有返回带有错误响应的函数。

请在 catch 块中发送响应以终止函数并避免超时错误

建议：

返回相应的状态码和相应的错误信息

【参考方案2】：

我也在关注那个教程。事实证明，您只需将 ssl 属性添加到您的 proConfig

const proConfig = 
  connectionString: process.env.DATABASE_URL,
  ssl: 
    rejectUnauthorized: false
  
;

来源：Node.js, PostgreSQL error: no pg_hba.conf entry for host