# HEADER_CONTENT_TYPE

> `const` **HEADER\_CONTENT\_TYPE**: `3` = `3`

Defined in: [packages/filecoin-encryption-envelope/src/constants.ts:14](https://github.com/FilOzone/synapse-sdk/blob/4fe24ea1c76c9b1fa1489b7cdbb1cc279bd2576a/packages/filecoin-encryption-envelope/src/constants.ts#L14)

`content_type`, RFC 9052 §3.1. Media type of the plaintext. Optional.