FetchOptions

{
  "headers": {
    string: string,
    ...
  }
}

map (key: string, value: string)

Custom headers to pass into fetch request. Headers must have a maximum of 3 key value pairs. Each key value pair must have a maximum of 256 characters per key and 256 characters per value.

An object containing a list of "key": value pairs. Example: { "name": "wrench", "mass": "1.3kg", "count": "3" }.