If varnish closes the connection while a client is waiting for an
rxsomething command you may run into this kind of scenario:

    ***  c1   HTTP2 rx failed (fd:20 read: Connection reset by peer)
    ***  c1   rx: stream: 0, type: DATA (0), flags: 0x00, size: 0
    **** c1   s0 - no data
    ---- c1   Wrong frame type DATA (0) wanted SETTINGS

This was already done correctly for the frame body.