unregister_default_headers()

unregister_default_headers() — Unregisters default headers. This function must be called after register_default_headers() has already added the header you want to remove.

Inputs: $header (string|array): The header string id (key of array) to remove, or an array thereof.

Returns bool|null: A single header returns true on success, false on failure. There is currently no return value for multiple headers.