@fastify/reply-from/test/on-invalid-upstream-response.test.js

forward your HTTP request to another server, for fastify

'use strict'

const t = require('tap')
const Fastify = require('fastify')
const From = require('..')
const http = require('node:http')
const get = require('simple-get').concat

const instance = Fastify()
instance.register(From)

t.plan(8)
t.teardown(instance.close.bind(instance))

const target = http.createServer((req, res) => {
  t.pass('request proxied')
  t.equal(req.method, 'GET')
  res.statusCode = 888
  res.end('non-standard status code')
})

instance.get('/', (_, reply) => {
  reply.from(`http://localhost:${target.address().port}`, {
    onResponse: (_, _reply, res) => {
      t.equal(res.statusCode, 888)
    }
  })
})

t.teardown(target.close.bind(target))

instance.listen({ port: 0 }, (err) => {
  t.error(err)

  target.listen({ port: 0 }, (err) => {
    t.error(err)

    get(
      `http://localhost:${instance.server.address().port}`,
      (err, res, data) => {
        t.error(err)
        t.equal(res.statusCode, 502)
        t.same(JSON.parse(data), {
          statusCode: 502,
          code: 'FST_REPLY_FROM_BAD_GATEWAY',
          error: 'Bad Gateway',
          message: 'Bad Gateway'
        })
      }
    )
  })
})