jthomas commented on issue #325: Support for invocations based on websocket 
messages
URL: 
https://github.com/apache/incubator-openwhisk-apigateway/issues/325#issuecomment-433982367
 
 
   This would be an excellent feature of the API Gateway 👏. Websocket support 
is something developers ask about a lot... 
   
   - We would need to define the error handling process when the the triggers 
are unavailable or rate-limited. How would we signify to a client that a 
message wasn't delivered?
   
   Another (more difficult) thing to consider is how to make it possible for 
messages to be sent to listening clients outside of responding to an incoming 
event. If we take one of the most common examples for a websocket application, 
a chat application, how could we enable this feature? 
   
   Ideally, an action could call the API Gateway service with a message to pass 
to one or more clients currently connected to pass messages that arrived from 
other sources.

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