headers

A Record<string, string | string[]> representing the HTTP response headers. The headers object is formatted as follows:

• All header names are lowercased.

• Duplicates of age, authorization, content-length, content-type, etag, expires, from, host, if-modified-since, if-unmodified-since, last-modified, location, max-forwards, proxy-authorization, referer, retry-after, server, or user-agent are discarded.

• set-cookie is always an array. Duplicates are added to the array.

• For duplicate cookie headers, the values are joined together with '; '.

• For all other headers, the values are joined together with ', '.