All requests go through one socket thread, no matter which HTTP version. I am not a Necko engineer, but since requests can be upgraded, an HTTP/1 request could

All requests go through one socket thread, no matter which HTTP version. I am not a Necko engineer, but since requests can be upgraded, an HTTP/1 request could switch to HTTP/2 and if there was a separation by protocol, the request would have to be "moved" to a different thread. So I'm not sure that would work easily.