The default is tlsmaxrsasize=8192, limiting RSA to 8192-bit keys. To avoid
denial of service attacks, this setting and default was backported to Go
1.19.13, Go 1.20.8, and Go 1.21.1.

Go 1.22 made it an error for a request or response read by a net/http
client or server to have an empty Content-Length header.
This behavior is controlled by the `httplaxcontentlength` setting.

Go 1.22 changed the behavior of ServeMux to accept extended

pkg net/http, type ResponseController struct #54136
pkg net/http, type Server struct, DisableGeneralOptionsHandler bool #41773
pkg net/http, type Transport struct, OnProxyConnectResponse func(context.Context, *url.URL, *Request, *Response) error #54299
pkg net/netip, func IPv6LinkLocalAllRouters() Addr #51766
pkg net/netip, func IPv6Loopback() Addr #51777