---
page_type: error
code: 11100
message: "11100: Invalid URL format"
level: ERROR
product: Programmable Messaging
---

## Description

The format of the provided URL is invalid.

### Possible Causes

- Bad URL for phone number configuration
- Bad URL passed to outgoing call REST request
- Bad URL in Play or Redirect Verb Body
- Bad URL provided for a verb's action attribute
- No URL provided in Record verb action attribute when modifying a live call
- Unsupported characters in auth portion of URL

### Possible Solutions

- Make sure you submit a fully qualified URL including: protocol (http:// or https://), hostname, file path, properly url-encoded query parameters.
- Twilio must be able to reach this URL over the public Internet.