Discussion on: How to host a Sapper.js SSR app on Firebase.

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Thanks a lot for the step-by-step guide.
I created a small rss reader with svelte/sapper, in which I have implemented a backend-api to get and delete a list representing the rss feed. How do I get the backend to work as well? Currently I get 404s.

For the purposes of handling all requests to the /api, i created an api.js:

import express from 'express'
import Parser from 'rss-parser'

const rssList = new Set()

const parser = new Parser()

export default (server) => {
    const router = express.Router()

    router.post('/add', (req, res) => {
        const { url } = req.body

        if (rssList.has(url)) {
            return res.send({ added: false, rssList: [...rssList] })
        }

        rssList.add(url)
        return res.send({ added: true, rssList: [...rssList] })
    })

    router.post('/delete', (req, res) => {
        const { url } = req.body

        if (rssList.has(url)) {
            rssList.delete(url)
            return res.send({ deleted: true, rssList: [...rssList] })
        }

        return res.send({ deleted: false, rssList: [...rssList] })
    })

    router.get('/list', (_, res) => {
        res.send({ rssList: [...rssList] })
    })

    router.get('/refresh', async (req, res, next) => {
        try {
            let result = []
            for (const url of rssList) {
                const feed = await parser.parseURL(url)
                result.push(...feed.items)
            }

            result = result.sort((a, b) => (a.isoDate > b.isoDate ? 1 : 0))

            res.send({ result })
        } catch (err) {
            console.log(err)
            next(err)
        }
    })

    return router
}

In my server.js I import the apiRouter form api.js and simply added it as middleware:

    server.use('/api', apiRouter())

You can find the repo (branch) here: github.com/basti-n/rss-reader-sapp...