Send RST_STREAM on stream errors. Reject capital headers with stream errors.
Debug-only runtime tracking of funcs running on correct goroutines.
Don't allocate mapping response codes to strings.
Require pseudo headers in requests. Clear state between requests.
Require http or https scheme for now in incoming requests.
Require exactly one pseudo header.
Require regular headers after pseudo headers.
Add Framer.WritePing
Respond to PING frames.
remove Error type. no longer used.