overleaf/services/web/frontend/js/infrastructure/http-status-messages.ts

export function getErrorMessageForStatusCode(statusCode?: number) {
  if (!statusCode) {
    return 'Unknown Error'
  }

  const statusCodes: { readonly [K: number]: string } = {
    400: 'Bad Request',
    401: 'Unauthorized',
    403: 'Forbidden',
    404: 'Not Found',
    422: 'Unprocessable Entity',
    429: 'Too Many Requests',
    500: 'Internal Server Error',
    502: 'Bad Gateway',
    503: 'Service Unavailable',
  }

  return statusCodes[statusCode] ?? `Unexpected Error: ${statusCode}`
}