---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/420035#article
headline: "420035: Knowledge source bad request"
url: https://www.twilio.com/docs/api/errors/420035
inLanguage: en
dateModified: 2026-07-29T18:16:50.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 420035: Knowledge source bad request

Log Type: TWILIO

Log Level: ERROR

## Description

The web crawler received a `400 Bad Request` when attempting to access the target URL during knowledge ingestion.

### Possible causes

* The URL contains invalid query parameters or malformed request syntax
* The target server rejected the crawler's request format
* Required headers or authentication information are missing
* The target site has strict validation that rejects automated crawlers

### Possible solutions

* Verify the URL is correctly formatted with valid query parameters
* Ensure the URL is publicly accessible without special authentication requirements
* Test the URL in a web browser to confirm it loads without errors
* Remove the knowledge source if it requires authentication or special headers that the crawler cannot provide
* Review the knowledge source error details in the Twilio Console for more information