Language: JavaScript
Label: safe
CWE: CWE-352 \u2014 Cross-Site Request Forgery (CSRF)
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.

Code:
function is_content_type(request, ...types) {
	const type = request.headers.get('content-type')?.split(';', 1)[0].trim() ?? '';
	return types.includes(type.toLowerCase());
}