---
url: /errors/invalid_callback_url.md
---
# `invalid_callback_url`

## Description

The callback URL supplied to OCR is not an allowed internal callback target.

## HTTP Status

`422 Unprocessable Entity`

## Typical Causes

* The URL is malformed or not HTTPS.
* Its host, port, path prefix, credentials, fragment, or resolved address
  violates the OCR callback policy.

## How To Fix

Send an HTTPS callback URL matching an allowlisted internal target.