communication webhook_security ai_generated true

Twilio webhook signature validation fails — URL mismatch with proxy

ID: communication/twilio-webhook-signature-validation-fail

Also available as: JSON · Markdown
88%Fix Rate
90%Confidence
4Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
any active — — —

Root Cause

Twilio signature validation fails because URL used for validation does not match what Twilio sees.

generic

Workarounds

  1. 90% success Use X-Forwarded-Proto and X-Forwarded-Host to reconstruct the original URL 
    Reconstruct URL from forwarded headers for signature validation

    Sources: https://www.twilio.com/docs/usage/webhooks/webhooks-security

  2. 88% success Configure Twilio webhook URL to match the exact public-facing URL 
    Use https:// in Twilio console matching the exact URL your proxy exposes

    Sources: https://www.twilio.com/docs/usage/webhooks/webhooks-security

Dead Ends

Common approaches that don't work:

  1. Disable signature validation as a workaround 95% fail

    Disabling validation exposes the webhook to spoofed requests

  2. Hardcode the webhook URL in validation 65% fail

    Hardcoded URL becomes wrong when deployment URL changes