Nginx with a streaming endpoint

[scd31]

Hello,

I'm trying to set up a streaming endpoint that is potentially very low throughput. I'm finding that with Nginx as a reverse proxy, if I don't send a message for 60 seconds, the connection is killed. I was hoping to use some of the keepalive settings to maintain the connection but I haven't been having any luck.

My code:

    let endpoint = Endpoint::from_static("https://[redacted]")
        .keep_alive_while_idle(true)
        .keep_alive_timeout(Duration::from_secs(5))
        .tcp_keepalive(Some(Duration::from_secs(5)));
    let mut client = HandlerClient::connect(endpoint).await?;

With tcpdump I can confirm there's no activity at all other than the actual messages. I don't see any keepalive stuff happening, and after 60 seconds the connection times out.

Is there anything else I need to configure for this to work?