---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21403#article
headline: "21403: Invalid Method"
url: https://www.twilio.com/docs/api/errors/21403
inLanguage: en
dateModified: 2025-12-18T21:40:49.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21403: Invalid Method

Log Level: ERROR

## Description

You attempted to update the HTTP method that Twilio uses when somebody calls your phone number, but the Method you supplied was not valid. Valid Method values are `GET` or `POST`.