zob_cloud

Which internal health checks are you referring to?

Browsers typically use a few connections to load a page so that it can load faster. Each of those threads has a different source port, and thus may route to a different target. In Colm's demo, it depends which thread your browser uses when requesting the part including the CSS which decorates the object. In my Chrome on Mac I see 6 TCP connections to the demo NLB

tcp4 0 0 192.168.100.101.49615 54.69.111.179.80 ESTABLISHED tcp4 0 0 192.168.100.101.49614 54.69.111.179.80 ESTABLISHED tcp4 0 0 192.168.100.101.49613 54.69.111.179.80 ESTABLISHED tcp4 0 0 192.168.100.101.49612 54.69.111.179.80 ESTABLISHED tcp4 0 0 192.168.100.101.49611 54.69.111.179.80 ESTABLISHED tcp4 0 0 192.168.100.101.49610 54.69.111.179.80 ESTABLISHED

Each of those will be routed to the same target, so it's up to your browser to decide which to use for what.

There are ways of finding out more... https://www.amazon.jobs/en/jobs/518372/senior-software-devel...

Better off depends on what your workload goals are. If you want path or host name based routing, Application load balancer may be a better fit as it natively supports WebSockets. If your goal is long lived sessions (weeks and months, not minutes and hours), Network load balancer is probably a better fit.

And they're free! Although only can be used on AWS services, currently ELB and CloudFront. https://aws.amazon.com/certificate-manager/

Yes they do.

For a single connection the websocket will always go to the same back end regardless of sticky sessions being enabled.

If stickyness is enabled, and the same client creates a new websocket, it will go to the same back end as previous connections.

ELB Classic & ELB Application Load Balancer don't support multiple SSL certificates. There is support multiple Subject Alternative Names (SANs https://en.wikipedia.org/wiki/Subject_Alternative_Name)

And there is support for wildcard certificates, *.example.com

You can request a cert through AWS Certificate Manager with multiple names, more info https://docs.aws.amazon.com/acm/latest/userguide/gs-acm-requ...

This is not using Server Name Indicator / SNI.