Server Sent Events in GAE Standard

[Steve Neal]

I need to send messages from the Web server to a browser based application.

Server Sent Events are an obvious choice but I cannot see any supporting documentation. Is it possible to do this with GAE standard using Java 8 ?

If not, is there a way to run web sockets, or some other technology that will allow messages to be sent to the browser. I don't want to resort to polling from the browser.

Thanks, Steve.

[Steren Giannini]

Hi,

Server sent events are based on the HTTP protocol, so I expect them to work on App Engine.

We do not provide specific documentation, I followed this one in the past: https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events. 

Let us know how if they work as expected for you.

Websockets are not supported on App Engine.

Steren

Product Manager

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[Barry Hunter]

Well as such Server Sent Events IS long-polling!

.. it's just wrapping it up in a 'multi-part' message, but as noted its still HTTP, using Chunked encoding. 

... and a browser provided trigger mechanism to catch each new 'event' message. 

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[Steren Giannini]

You are correct. 

And because App Engine in automatic scaling mode has a 60 sec request timeout, this probably means that your events cannot be separated by more than 60sec.

Give it a try, let us know.

To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/CAJCAUu%2BXN547NFR_jdaSQnggiwVij%2Bm9M6hUDm073tFGcqMe8g%40mail.gmail.com.

[Steve Neal]

Thanks for the advice - I'll add a comment to this pwhen I've had a chance to try Server Side Events.

[Attila-Mihaly Balazs]

Also, I would expect this not to work since the AppEngine instances don't talk directly to the client, but rather go trough the Google Front-end which buffers both requests and responses (so neither can be streamed).

Attila

[Roxana Ioana Mirel]

On Appengine, we've been using Pusher for this, but you could also look into Firebase Cloud Messaging.

Regards,

Roxana