Heroku-部署React / Express应用并在请求chunk.js文件时在控制台中获取“无法加载资源”

Question

在我的React应用程序已构建并部署到Heroku上之后，我在控制台中收到这些错误。

Refused to apply style from 'https://radiant-tor-66940.herokuapp.com/index.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
Failed to load resource: the server responded with a status of 404 (Not Found) main.3174e036.chunk.js:1 
Failed to load resource: the server responded with a status of 404 (Not Found) 1.b1e0c624.chunk.js:1 
Failed to load resource: the server responded with a status of 404 (Not Found) main.3174e036.chunk.js:1 
Failed to load resource: the server responded with a status of 404 (Not Found) manifest.json:1
Manifest: Line: 1, column: 1, Unexpected token. manifest.json:1

index.js文件位于我的Heroku服务器上的/client/build/中。这是我的Express服务器发送的文件。服务器正在发送此index.html文件，但是文件本身找不到所需的资源。

这导致加载空白应用程序的问题。 F由于某些原因index.html在chunk.js内找不到/client/build/static/js文件。它们肯定在那里，我可以通过heroku run bash进行确认并检查目录。

当我在浏览器中检查index.html文档时，我可以在底部看到脚本标签在chunk.js中调用/static/js文件的地方：

应用的根package.json如下所示：

  "scripts": {
    "test": "jest",
    "start": "node server/server.js",
    "heroku-postbuild": "cd client && npm install --only=dev && npm install && npm run build"
  },
  "engines": {
    "node": "~9.10.1",
    "npm": "~5.6.0"
  }

package.json中的React应用的/client如下所示：

{
  "name": "client",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "axios": "^0.19.0",
    "lodash": "^4.17.11",
    "react": "^16.7.0",
    "react-dom": "^16.7.0",
    "react-redux": "^6.0.0",
    "react-router-dom": "^4.3.1",
    "react-scripts": "2.1.3",
    "redux": "^4.0.1",
    "redux-thunk": "^2.3.0",
    "styled-components": "^4.1.3"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": [
    ">0.2%",
    "not dead",
    "not ie <= 11",
    "not op_mini all"
  ],
  "proxy": "http://localhost:8000/"
}

以下是Heroku构建后的文件结构：

• 第一张图片：/client目录
• 第二张图片：/client/build目录
• 第三张图片：/client/build/static/js目录

Answer 1

问题实际上出在我的server.js文件中，我没有在本文中提及。

最初是express.static(path_join(__dirname, '/client/build'))

它必须为：express.static(path_join(__dirname, '../client/build'))

之所以如此，是因为我的server.js文件位于/server中，并且它试图在/client/build内而不是Heroku的根应用程序目录中找到/server。