[hboon]

The @see link on Status::CLIENT_CLOSED_REQUEST (499) points to https://httpstatuses.com/499. Every httpstatuses.com URL now returns a 301 to a web agency glossary (https://www.webfx.com/web-development/glossary/), so the rendered API docs at https://docs.aplus-framework.com/classes/Framework-HTTP-Status.html send readers there too. MDN has no page for 499, which is probably why this constant doesn't use an MDN link like most of the class.

This PR points the link to https://httpstatuses.net/499/. That page covers where 499 comes from (nginx's NGX_HTTP_CLIENT_CLOSED_REQUEST), when nginx logs it, and the gRPC CANCELLED to 499 mapping.

I run httpstatuses.net. It isn't affiliated with httpstatuses.com. If you prefer a primary source, nginx defines 499 in https://github.com/nginx/nginx/blob/master/src/http/ngx_http_request.h, and I can switch the link to it.

[natanfelles]

Please also point the Status::NETWORK_CONNECT_TIMEOUT_ERROR link to httpstatuses.net.

[natanfelles]

I have decided that these two constants will be removed in the next version. Thank you!