FetchRequestHeader

type FetchRequestHeader: 
  | "Accept"
  | "Content-Type"
  | "Authorization"
  | "User-Agent"
  | "Referer"
  | "Cache-Control"
  | "Accept-Encoding"
  | "Origin"
  | "Connection"
  | "Cookie"
  | "Pragma"
  | "If-Modified-Since";

Represents common request headers used in HTTP requests. This type is a string union of common request header names. For example: 'Accept', 'Content-Type', 'Authorization', etc.