Function getHeaderName

src/helpers/headers.ts:6–7

(headers: Headers<T>, name: string)

 * Given a headers object retrieve a specific header out of it via a case-insensitive key.
 */
export const getHeaderName = <T>(headers: Headers<T>, name: string) =>
  Object.keys(headers).find(header => header.toLowerCase() === name.toLowerCase());

/**
 * Given a headers object retrieve the contents of a header out of it via a case-insensitive key.