I'm trying to proxy a websocket through Apache 2.4.7 (running on Ubuntu).
The connection is correctly established but if the browser or the server don't send each other data for some time (few minutes) new messages coming from the server are not delivered to the browser.  

Furthermore, nor the browser or the service on the server seem to realize the connection is somehow broken (they don't throw any error at all).

How can I configure the server in order to avoid this issue?

This is my configuration:

```
ProxyRequests Off
ProxyPass /somepath ws://127.0.0.1:6080/ retry=60 keepalive=On timeout=9999 ttl=9999
ProxyPassReverse /somepath ws://127.0.0.1:6080/ retry=60

```