请看我的回答here。

• src-ssr/middlewares/api.ts自定义中间件，用于捕获/api/*上的命中，当找到配置的路由时，将加载并执行API处理程序

import { ssrMiddleware } from 'quasar/wrappers'
import routes from '../../src/api/_routes'
import type { Request, Response } from 'express'
import { parse } from 'url'

export default ssrMiddleware(async ({ app, resolve }) => {
    app.all(resolve.urlPath('*'), async (req: Request, res: Response, next) => {
        const { pathname } = parse(req.url)
        if (!pathname || !pathname.startsWith('/api')) {
            return next()
        }

        const path = pathname.replace(/^\/api/, '')

        if (!Object.keys(routes).includes(path)) {
            res.sendStatus(404).end()
            return
        }

        console.log(`API hit on ${path}`)

        try {
            const handler = (await routes[path as keyof typeof routes]())
                .default
            handler(req, res)
        } catch (error) {
            console.error(error)
            res.sendStatus(500).end()
        }
    })
})

• 在src/api/routes.ts中配置API路由，如下所示：

const routes = {
    '/ping': () => import('./ping'),
}

export default routes

• 并编写您的API路由，例如。src/api/ping.ts

import type { Request, Response } from 'express'

export default function (req: Request, res: Response) {
    res.status(200).send('pong')
}