expectsJson method
True when the client wants a JSON answer, not a page: an Accept
header with json, a JSON body, or an X-Requested-With: XMLHttpRequest header. An Inertia request (X-Inertia) is not.
Implementation
bool expectsJson() {
if (header('x-inertia') != null) return false;
String accept = header(HttpHeaders.acceptHeader) ?? '';
if (accept.contains('/json') || accept.contains('+json')) return true;
return isJson() || header('x-requested-with') == 'XMLHttpRequest';
}