SSE (EventSource), with bidirectional emulation
SSE (EventSource) connection endpoint in Centrifugo is:
Enables SSE (EventSource) endpoint. And enables emulation endpoint (
/emulation by default) to accept emulation HTTP requests from clients.
Default: 65536 (64KB)
Maximum allowed size of a initial HTTP POST request in bytes when using HTTP POST requests to connect (browsers are using GET so it's not applied).