Headers: delete() method

The delete() method of the Headers interface deletes a header from the current Headers object.

This method throws a TypeError for the following reasons:

For security reasons, some headers can only be controlled by the user agent. These headers include the forbidden header names and forbidden response header names.

Syntax

delete(name)

name: The name of the HTTP header you want to delete from the Headers object.

Creating an empty Headers object is simple:

const myHeaders = new Headers(); // Currently empty

You could add a header to this using Headers.append:

myHeaders.append("Content-Type", "image/jpeg");
myHeaders.get("Content-Type"); // Returns 'image/jpeg'

You can then delete it again:

myHeaders.delete("Content-Type");
myHeaders.get("Content-Type"); // Returns null, as it has been deleted

Specification
Fetch Standard # ref-for-dom-headers-delete①

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