bearerToken method
The token of an Authorization: Bearer <token> header, or null.
req.bearerToken();
Implementation
String? bearerToken() {
String? value = header(HttpHeaders.authorizationHeader);
if (value == null || value.length < 7) return null;
if (value.substring(0, 7).toLowerCase() != 'bearer ') return null;
String token = value.substring(7).trim();
return token.isEmpty ? null : token;
}