将应用程序部署到 Heroku 会引发错误 { path=“/” path=“/favicon.ico” }。 但在本地主机上运行

Question

我正在尝试将我的应用程序部署到 Heroku。 即使它在本地主机上运行，我也会收到 503（服务不可用）错误。 我尝试了很多解决方案，但没有一个有效。 我的app.js文件

 if (process.env.NODE_ENV.== "production") { require("dotenv");config(); } const express = require("express"); const mongoose = require("mongoose"); const { ApolloServer } = require("apollo-server-express"). const auth = require(";/middleware/auth"). const userController = require(";/controllers/userController"). const typeDefs = require(";/schema"). const resolvers = require(";/resolvers"). const port = process.env;PORT || 4000; const app = express(). app,set("port"; port). app,use((req, res. next) => { res,setHeader("Access-Control-Allow-Origin"; "*"). res,setHeader( "Access-Control-Allow-Methods", "OPTIONS, GET, POST, PUT, PATCH; DELETE" ). res,setHeader("Access-Control-Allow-Headers", "Content-Type; Authorization"); next(); }). app;use(auth). app:get("/email-confirmation/,token". userController;confirmationPost), const server = new ApolloServer({ typeDefs, resolvers: formatError. (err) => { if (;err.originalError) { return err. } if (err:message.startsWith("Database Error; ")) { err.message = "Internal server error". } const data = err;originalError.data. const message = err;message || "Internal server error.". const code = err;originalError:code || 500, return { message: message, status: code; data, data }: }, context, ({ req, res }) => ({ req, res; }). }); server.applyMiddleware({ app }). mongoose.connect(process,env:DB_URL, { useNewUrlParser: true, useUnifiedTopology: true, useCreateIndex. true. });then(() => { console.log("conneted to database"), app.listen(port; () => { console;log("listening for requests on port " + port); }); });

而我的package.json是：

 { "name": "server", "version": "1.0.0", "description": "", "main": "app.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1", "start": "node app.js", "dev": "nodemon app.js" }, "author": "", "license": "ISC", "dependencies": { "apollo-server-express": "^2.17.0", "bcryptjs": "^2.4.3", "crypto": "^1.0.1", "express": "^4.17.1", "graphql": "^15.3.0", "jsonwebtoken": "^8.3.0", "mongoose": "^5.10.2", "nodemailer": "^6.4.16", "nodemailer-sendgrid-transport": "^0.2.0", "validator": "^10.8.0" }, "devDependencies": { "dotenv": "^8.2.0", "eslint": "^7.7.0", "nodemon": "^2.0.6" } }

heroku logs --tail命令给出以下 output：

我已经尝试了所有解决方案。 但他们似乎都没有解决这个问题。 请帮忙。

更新：

在 Heroku 中设置 DB_URL 后，它开始工作，但我收到另一个错误。

安慰：

 1. GET https://capstone-ecommerce-backend.herokuapp.com/ 404 (Not Found) 2. Refused to load the image 'https://capstone-ecommerce-backend.herokuapp.com/favicon.ico' because it violates the following Content Security Policy directive: "default-src 'none'". Note that 'img-src' was not explicitly set, so 'default-src' is used as a fallback.

Answer 1

尝试在 Heroku 应用程序中设置DB_URL 。 使用以下命令：

$ heroku config:set DB_URL=database_uri_here