Re: [google-appengine] Server Sent Events in GAE Standard

[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

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Re: [google-appengine] Server Sent Events in GAE Standard

[Steve Neal]

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


On Monday, 6 August 2018 17:19:28 UTC+2, Steren Giannini wrote:
>
> 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.
>
> On Mon, Aug 6, 2018 at 7:39 AM Barry Hunter  > wrote:
>
>> 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. 
>>
>>
>>
>>
>> On Mon, Aug 6, 2018 at 2:07 PM Steve Neal > > wrote:
>>
>>>
>>> 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.
>>>
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Re: [google-appengine] Server Sent Events in GAE Standard

['Steren Giannini' via Google App Engine]

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.

On Mon, Aug 6, 2018 at 7:39 AM Barry Hunter  wrote:

> 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.
>
>
>
>
> On Mon, Aug 6, 2018 at 2:07 PM Steve Neal  wrote:
>
>>
>> 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.
>>
>> --
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>> 
>> .
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>>
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Re: [google-appengine] Server Sent Events in GAE Standard

[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.




On Mon, Aug 6, 2018 at 2:07 PM Steve Neal  wrote:

>
> 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.
>
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> 
> .
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>

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Re: [google-appengine] Server Sent Events in GAE Standard

['Steren Giannini' via Google App Engine]

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

On Mon, Aug 6, 2018, 06:07 Steve Neal  wrote:

>
> 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.
>
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> 
> .
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>

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[google-appengine] Server Sent Events in GAE standard environment - ADVICE PLEASE

[Steve Neal]

I need to be able send notifications to a web application from the app 
engine server. For me Server Sent Events seem to be the best option. 
However, I cannot find any supporting docs for this in GAE standard 
environment (Java 8). 

Is this feature implemented at all in GAE?

Is there something else I should be looking for? web sockets are another 
possibility for me, but from what I can tell, they aren't supported.

Thanks.

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[google-appengine] 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.

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