Function getHeader

src/helpers/headers.ts:12–18

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

 * Given a headers object retrieve the contents of a header out of it via a case-insensitive key.
 */
export const getHeader = <T>(headers: Headers<T>, name: string) => {
  const headerName = getHeaderName(headers, name);
  if (!headerName) {
    return undefined;
  }
  return headers[headerName];
};

/**
 * Determine if a given case-insensitive header exists within a header object.