# 70155: Request Is Missing Required HTTP Headers

Log Level: ERROR

## Description

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/iam/pkcv/quickstart)