TsgcWebSocketProxyServer › Properties › FallBack
Provides Server-Sent Events as an alternative transport for browsers that do not support native WebSockets.
property FallBack: TsgcWSFallBack_Options read FFallBack write SetFallBack;ServerSentEvents.Enabled=False
Enable ServerSentEvents.Enabled to let the proxy push events to browser clients using the HTML5 SSE specification; the Retry sub-property sets the interval in seconds before the browser tries to reconnect (3 by default). Fall-backs are negotiated transparently on the first request, so traffic is still forwarded to the upstream server defined in Proxy regardless of the transport finally used with the client.
oProxy := TsgcWebSocketProxyServer.Create(nil);
oProxy.FallBack.ServerSentEvents.Enabled := true;
oProxy.FallBack.ServerSentEvents.Retry := 3;
oProxy.Proxy.Host := 'upstream.example.com';
oProxy.Proxy.Port := 8080;
oProxy.Active := true;