owncast/contrib/varnish/vanish.vcl

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vcl 4.0;
backend default {
.host = "localhost";
.port = "8080";
}
sub vcl_recv {
# Implementing websocket support (https://www.varnish-cache.org/docs/4.0/users-guide/vcl-example-websockets.html)
if (req.http.Upgrade ~ "(?i)websocket") {
return (pipe);
}
}
sub vcl_pipe {
if (req.http.upgrade) {
set bereq.http.upgrade = req.http.upgrade;
set bereq.http.connection = req.http.connection;
}
}
sub vcl_backend_response {
# Set 1s ttl if origin response HTTP status code is anything other than 200
if (beresp.status != 200) {
set beresp.ttl = 1s;
set beresp.uncacheable = true;
return (deliver);
}
if (bereq.url ~ "m3u8") {
# assuming chunks are 2 seconds long
set beresp.ttl = 1s;
set beresp.grace = 0s;
}
if (bereq.url ~ "ts") {
set beresp.ttl = 10m;
set beresp.grace = 5m;
}
}