WebSocket connections. It has no extra dependencies or configuration options
beyond what L<Plack::App::Proxy> requires or provides, so it may be an easy
drop-in replacement. Read the documentation of that module for advanced usage
-not covered by the L<SYNOPSIS>.
+not covered here.
This subclass necessarily requires extra L<PSGI> server features in order to
work. The server must support C<psgi.streaming> and C<psgix.io>. It is also