Twilio Guias de prueba de webhooks

Replay + helper de firma (dashboard)

Open /dashboard or /dashboard/tunnels and use Webhook Command Center for this provider. It gives one-click replay and signature verification helpers.

instatunnel webhook verify --provider twilio --secret-env TWILIO_AUTH_TOKEN

curl -i -X POST "https://YOUR-SUBDOMAIN.instatunnel.my/webhooks/twilio/sms" -H "Content-Type: application/json" --data-binary @sample-twilio.json

Required signature header: x-twilio-signature

1. Setup local de app

Create a local webhook endpoint at: /webhooks/twilio/sms

import express from 'express'
import twilio from 'twilio'

const app = express()
app.use(express.urlencoded({ extended: false }))

app.post('/webhooks/twilio/sms', (req, res) => {
  const signature = req.header('x-twilio-signature') || ''
  const url = process.env.PUBLIC_WEBHOOK_URL!
  const valid = twilio.validateRequest(
    process.env.TWILIO_AUTH_TOKEN!,
    signature,
    url,
    req.body
  )

  if (!valid) return res.status(403).send('invalid signature')

  console.log('sms from:', req.body.From, 'body:', req.body.Body)
  res.type('text/xml').send('<Response></Response>')
})

app.listen(3000, () => console.log('listening on :3000'))

2. Ejecutar comando InstaTunnel

instatunnel 3000 --subdomain twilio-dev

Keep a fixed subdomain so your provider dashboard URL does not keep changing.

3. Campos a pegar en proveedor

Use the helper below to generate exact values with your chosen subdomain and path.

4. Enviar evento de prueba

1. Set your Twilio phone number webhook URL to the tunnel URL.
2. Send an SMS to that Twilio number from your phone.
3. Validate received payload and XML response in local logs.

5. Verificar firma

Verify this header on every request: x-twilio-signature

const valid = twilio.validateRequest(
  process.env.TWILIO_AUTH_TOKEN!,
  req.header('x-twilio-signature')!,
  publicWebhookUrl,
  req.body
)
if (!valid) return res.status(403).send('invalid signature')

6. Reintentos e idempotencia

• Use MessageSid/CallSid as idempotency keys.
• Return valid TwiML quickly to prevent repeated retries.
• Log signature validation errors separately from business logic errors.

7. Fallos comunes y solucion rapida