Function isProblemDetailsResponse

http/unstable_problem_details.ts:415–422

(response: Response)

 * ```
 */
export function isProblemDetailsResponse(response: Response): boolean {
  const contentType = response.headers.get("Content-Type");
  if (contentType === null) return false;
  const semi = contentType.indexOf(";");
  const base = semi === -1 ? contentType : contentType.substring(0, semi);
  const mediaType = base.toLowerCase().trim();
  return mediaType === PROBLEM_JSON_MEDIA_TYPE;
}