503 服务不可用响应。 如何使用 Heroku 使用服务器端代码中继 API？

Question

Hi after reading about safe ways to store api keys, I've decided to build my own api relay deployed to heroku using goodreads api as an example. 目前从客户端收到以下消息：来自控制台的错误

以下是我的代码：

const express = require("express");
const fetch = require("node-fetch");
const parseString = require('xml2js').parseString;
const rateLimit = require("express-rate-limit");
const app = express();
const cors = require('cors');
const port = process.env.PORT || 5000;

app.use(cors());

app.set('trust proxy', 1);

const limiter = rateLimit({
  windowMs: 1000, // 1 second
  max: 1, // limit each IP to 1 requests per windowMs
});

app.use(limiter);

app.get("/", (req, res) => res.send("Hello World!"));

app.post("/api/:search", (req, res) => {
   const searchString = `q=${req.query.q}`;
   res.setHeader("Access-Control-Allow-Origin", "*");
   res.setHeader("Access-Control-Allow-Credentials", "true");
   res.setHeader("Access-Control-Allow-Methods", "OPTIONS,POST,GET");
   (async function fetchGoodReads() {
      const response = await fetch(
        `https://www.goodreads.com/search.xml?key=${process.env.GOODREADS_API_KEY}&${searchString}`
     );
     var xml = await response.text();
     parseString(xml, (err, result)=> res.send(result.GoodreadsResponse.search));
   })();
 });

 app.listen(port, () => console.log(`Relay app listening on port ${port}!`));

我也试过 postman，我得到的响应是来自 heroku 的错误页面。 欢迎任何帮助:)

Answer 1

我必须在 heroku 上设置我的 process.env 变量，然后它工作正常。 这是我发现如何做到这一点的地方