Re: Working Group Last Call for draft-ietf-httpbis-binary-message-01

On Fri, Feb 04, 2022 at 01:25:49PM +1100, Mark Nottingham wrote:
> This message begins Working Group Last Call for draft-ietf-httpbis-binary-message-01, 'Binary Representation of HTTP Messages'.
> 
>   https://datatracker.ietf.org/doc/draft-ietf-httpbis-binary-message/

I'm having three other comments:

- I don't see any way to advertise input truncation. I.e. a sender sends
  indeterminate-length data (i.e. HTTP/1.1 chunks or H2 DATA), and the
  connection or stream is suddenly shut. The only way I'm seeing to
  indicate this here is by putting a zero-sized chunk, which will not
  reflect what really happened (i.e. shutdown before zero chunk normally
  indicates a truncated message and it's important not to process it or
  cache it). The same issue exists with known-length content, where it
  seems impossible to feed data in multiple parts as they arrive without
  switching to indeterminate-length which seems to semantically represent
  chunks (hence will probably implicitly cause content-length to be ignored).

- I think it would be useful to be able to advertise a partial message, for
  example for remote analysis, or if we'd want a server to transfer some of
  its in-progress processing to another one. Maybe that would be done using
  byte-range, I don't know. But at least it ought to be suggested so that
  the solutions adopted remain clean and interoperable.

- depending on the targetted use cases, being able to also pass the HTTP
  version could make sense. For example, indicating and an incoming message
  comes from an HTTP/1.0 client tells the recipient that certain features
  cannot be used. Also for logging it can be useful. Wouldn't it be the
  right moment to register the ":version" pseudo-header field that was
  not needed for H2 ?

Willy