export const hasHeader = (soughtHeader, headers) => { soughtHeader = soughtHeader.toLowerCase(); for (const headerName of Object.keys(headers)) { if (soughtHeader === headerName.toLowerCase()) { return true; } } return false; }; export const getHeaderValue = (soughtHeader, headers) => { soughtHeader = soughtHeader.toLowerCase(); for (const headerName of Object.keys(headers)) { if (soughtHeader === headerName.toLowerCase()) { return headers[headerName]; } } return undefined; }; export const deleteHeader = (soughtHeader, headers) => { soughtHeader = soughtHeader.toLowerCase(); for (const headerName of Object.keys(headers)) { if (soughtHeader === headerName.toLowerCase()) { delete headers[headerName]; } } };