Totally reliable delivery service disconnect from server

Totally reliable delivery service disconnect from server manual#
Totally reliable delivery service disconnect from server software#

The answer is bad news: there is nothing we can do! The reason it ever works is that every few minutes it reconnects and the 'reliability' of SSE means we get the messages that were swallowed.Д¬ue a bunch of devs and devops scouring the internet for what is actually happening, what we forgot and what we need to set to make this work. What's happening is this - something between our servers and the client's computer is screwing up the events, holding them forever. 'Our events were never getting delivered for some clients' - oh crap, architectural failure, a reason for sporadic bugs has suddenly escalated into a priority 1, my underwear is on fire, cock up. Except our events were never ever getting delivered for a small number of clients. It was a major clean up of our process and much faster and massively scalable. Since launch we've used Server Sent Events for notifications to the client, but recently we move to using it for more -> basically we send requests to the server which return immediately that they are enqueued and then the results pitch up later via a server event. It must be a network thing and sure enough it is. Ok, eventually I think to ask 'how slow?' - 20 minutes - wooooo - 20 minutes isn't 'slow' to login, 20 minutes is basically utterly f**ked. Hmmmm.Д¬lient reports it's still 'very slow' to login. Nope, nothing slow, no undue load, all the servers operating well. Ok you think, slow to login let's take a look.

Totally reliable delivery service disconnect from server software#

Then 10 days later a client account manager says 'XYZ Corp' are complaining that the software is 'slow' to login.

Totally reliable delivery service disconnect from server manual#

I hate feeling like an idiot, you know the score, I released a version of our software, automated and manual tests say it's fine, scalability tests say it's fine.

Don't expect your events to get delivered any time soon on some corporate or older networks.

Buried down in the spec, in the fine print, is something that renders them completely unreliable in uncontrolled environments (apps and public websites that must be generally available).

Many articles proclaim their benefits like automatic reconnection including catching up on missed messages, being easier and more reliable than sockets etc.Server Sent Events are a long established and recommended method of pushing from the server to the client.I've had an incident with SSE that's caused real client pain, I detail it below.