libnginx-mod-nchan - 1.14.2-2+deb10u5 main

Nchan is a scalable, flexible pub/sub server for the modern web, It can be
configured as a standalone server, or as a shim between your application and
tens, thousands, or millions of live subscribers. It can buffer messages in
memory, on-disk, or via Redis. All connections are handled asynchronously and
distributed among any number of worker processes. It can also scale to many
nginx server instances with Redis.
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Full documentation available at https://nchan.slact.net