---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/30122#article
headline: "30122: Fallback URL is invalid"
url: https://www.twilio.com/docs/api/errors/30122
inLanguage: en
dateModified: 2026-03-25T13:34:46.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 30122: Fallback URL is invalid

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when the fallback URL configured for a Messaging Service or incoming phone number is not a valid URL. Twilio requests the fallback URL when it can't retrieve or execute TwiML from the primary inbound request URL, and the fallback URL must be valid.

### Possible causes

* The `fallbackUrl` value is malformed or cannot be parsed as a valid URL. Twilio expects a valid URL for this setting.

### Possible solutions

* Replace `fallbackUrl` with a valid URL and save the Messaging Service or phone number configuration again. Twilio accepts any valid URL for this field.
* If you want to use a Twilio-hosted destination, point the fallback URL to a Studio Flow, TwiML Bin, or Twilio Function webhook URL.
* Set the fallback URL in the Messaging Service `fallbackUrl` field or in the phone number's Messaging Configuration, depending on where you manage inbound routing.

#### Additional resources

* [Services resource](/docs/messaging/api/service-resource)
* [Availability and Reliability](/docs/usage/security/availability-reliability)