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. Currently getting this below message from client-side: error from console

and below is my code:

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}!`));

I've also tried on postman, the response I get is the error page from heroku. Any help is welcome:)

Answer 1

I had to set my process.env variable on heroku then it worked fine. Here is where I found how to do that