---
page_type: error
code: 70155
message: "70155: Request Is Missing Required HTTP Headers"
level: ERROR
---

## Error - 70155

### Request Is Missing Required HTTP Headers

The JWT received by Twilio along with the request has defined a set of HTTP headers that must be validated. The actual request is missing at least one of those headers. This is a Public Key Client Validation Error.

#### Possible Solution:

- Make sure you are using the latest Twilio helper library.
- Make sure the JWT does not declare unnecessary headers.
- For the details on JWTs used as part of Public Key Client Validation, see [the documentation](/docs/api/credentials/public-key-client-validation-getting-started)