Re: WiSH: A General Purpose Message Framing over Byte-Stream Oriented Wire Protocols (HTTP)
Takeshi Yoshino <tyoshino@google.com> Tue, 22 November 2016 04:19 UTC
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From: Takeshi Yoshino <tyoshino@google.com>
Date: Tue, 22 Nov 2016 13:14:32 +0900
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To: Van Catha <vans554@gmail.com>
Cc: "ietf-http-wg@w3.org Group" <ietf-http-wg@w3.org>, Wenbo Zhu <wenboz@google.com>, Martin Thomson <martin.thomson@gmail.com>
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Subject: Re: WiSH: A General Purpose Message Framing over Byte-Stream Oriented Wire Protocols (HTTP)
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Ah, no. Martin just warned us that we might face the same issue that SSE faced. Mark's suggestion is a separate thing. The co-chairs (Mark and Patrick) said that this (WiSH) doesn't seems to be a topic that should be discussed in the HTTP WG given the charter of the WG, I think. On Sun, Nov 20, 2016 at 12:26 PM, Van Catha <vans554@gmail.com> wrote: > I do not understand what this means. Is the suggestion to ignore WiSH for > now in favor of SSE? > > On Fri, Nov 18, 2016 at 1:55 AM, Takeshi Yoshino <tyoshino@google.com> > wrote: > >> I'd like to share the feedback on WiSH from IETF 97. >> >> ---- >> >> Due to limited time, I got just one on-site comment from Martin about >> comparison with Server-sent event (EventSource). >> >> As mentioned in the I-D, yes, this is kinda full-duplex SSE with the WS >> framing, and it might suffer from unexpected buffering by intermediaries if >> any as Martin said. >> >> WiSH should work well for deployment with TLS only (possibly with some >> non-TLS part beyond server side front-end but are under control of the >> service providers). Given the wide trend of encouraging TLS and browser >> vendors' implementation status of H2, I think we should prioritize layering >> simplicity than taking care of gain of WiSH/H2/TCP + transparent proxy >> (with unexpected buffering) case. For H2-less TLS-less environment, we can >> just use the WebSocket protocol. >> >> There can still be some risk of MITM (trusted) proxy and unexpected >> buffering with AntiVirus/Firewall for deployment with TLS, but other >> WebSocket/H2 mapping proposals also have issues of possible blocking, >> buffering, etc. WebSocket/TCP's handshake success rate for non-TLS port 80 >> was also not so good when it started getting deployed, and got improved >> gradually. I think the problems will get resolved once WiSH is accepted >> widely, and I believe the total pain and cost would be smaller. >> >> ---- >> >> Mark suggested that we should find some other right place than HTTP WG. >> I'll discuss this with Mark. Maybe we'll consult the DISPATCH WG. >> >> ---- >> >> Thanks everyone for the feedback. >> >> Takeshi >> >> On Thu, Nov 3, 2016 at 3:20 AM, Costin Manolache <costin@gmail.com> >> wrote: >> >>> Good timing - http://httpwg.org/http-extensions/encryption-preview.html is >>> addressing my concerns for >>> webpush ( and general 'encrypted content' ), we're still discussing some >>> details, but for this use >>> case metadata won't be needed. >>> >>> Costin >>> >>> >>> On Tue, Nov 1, 2016 at 10:34 PM Takeshi Yoshino <tyoshino@google.com> >>> wrote: >>> >>>> On Mon, Oct 31, 2016 at 5:57 AM, Wenbo Zhu <wenboz@google.com> wrote: >>>> >>>> >>>> >>>> On Sun, Oct 30, 2016 at 10:25 AM, Costin Manolache <costin@gmail.com> >>>> wrote: >>>> >>>> Thanks for the answer and pointers. From earlier responses, it seems >>>> possible to use GET >>>> or a non-web-stream request to would avoid the extra cost of the >>>> pre-flight. >>>> >>>> >>>> >>>> Yeah, at least the Content-Type in the HTTP request gets eliminated. >>>> >>>> >>>> One more question/issue: in some cases it would be good to send some >>>> metadata (headers) along with binary frames. For example in webpush the >>>> content is an encrypted >>>> blob, and needs headers for the key/salt. I would assume a lot of other >>>> 'binary' messages would >>>> benefit if simple metadata could be sent along. Would it be possible to >>>> use one of the reserved >>>> bits for 'has metadata' and add some encoded headers ? I know in >>>> websocket they are intended >>>> for 'extensions', but 'headers' seems a very common use case. >>>> >>>> Q about webpush: is the metadata different for each binary message? >>>> >>>> We discussed about metadata and how to use one of RSV bits etc. For the >>>> current version, let's make sure the WS compatibility is fully addressed >>>> (with minimum wire encoding like WiSH) >>>> >>>> >>>> Agreed. Let's discuss the metadata needs separately. I agree it's >>>> important. >>>> >>>> >>>> >>>> >>>> >>>> Having the binary frame use some MIME encoding to pass both text >>>> headers and the binary blob >>>> is possible - but has complexity and overhead. >>>> >>>> OTOH, if the binary blob relies on text headers (metata) to be useful, >>>> then you probably need define a dedicated MIME encoding. >>>> >>>> >>>> >>>> >>>> Costin >>>> >>>> On Sun, Oct 30, 2016 at 5:27 AM Takeshi Yoshino <tyoshino@google.com> >>>> wrote: >>>> >>>> Thanks, Van, Costin. >>>> >>>> On Sun, Oct 30, 2016 at 2:43 AM, Costin Manolache <costin@gmail.com> >>>> wrote: >>>> >>>> Good point - websocket is widely deployed, including IoT - and the >>>> header is pretty easy to handle anyways. >>>> +1. >>>> >>>> One question: is this intended to be handled by browsers, and exposed >>>> using the W3C websocket API ? >>>> Will a regular app be able to make WiSH requests and parse the stream >>>> by itself, without browser >>>> interference ? And if yes, any advice on how it interact with CORS ? >>>> >>>> >>>> The first step would be using Streams based upload/download via the >>>> Fetch API + protocol processing in JS. >>>> >>>> The next step could be either introduction of an optimized native >>>> implementation of WiSH parser/framer in the form of the TransformStream >>>> which can be used as follows: >>>> >>>> const responsePromise = fetch(url, init); >>>> responsePromise.then(response => { >>>> const wishStream = response.body().pipeThrough(wishTransformStream); >>>> function readAndProcessMessage() { >>>> const readPromise = wishStream.read(); >>>> readPromise.then(result => { >>>> if (result.done) { >>>> // End of stream. >>>> return; >>>> } >>>> >>>> const message = result.value; >>>> // Process the message >>>> // E.g. access message.opcode for opcode, message.body for the >>>> body data >>>> readAndProcessMessage(); >>>> }); >>>> } >>>> readAndProcessMessage(); >>>> }); >>>> >>>> and provide a polyfill that presents this as the WebSocket API, and (or >>>> skip the step and) go further i.e. native implementation for everything if >>>> it turns out optimization is critical. >>>> >>>> We need to discuss this also in W3C/WHATWG. >>>> >>>> Regarding CORS, if the request includes non CORS-safelisted headers, >>>> fetch() based JS polyfills will be basically subject to the CORS preflight >>>> requirement. We could try to exempt some of well defined headers if any for >>>> CORS like WebSocket handshake's headers and server-sent event's >>>> Last-Event-Id are exempted. Regarding the proposed subprotocol negotiation >>>> in the form of combination of the Accept header and the Content-Type >>>> header, the Accept header is one of the CORS-safelisted headers, so it's >>>> not a problem. The Content-Type header is considered to be >>>> non-CORS-safelisted if it's value is none of the CORS-safelisted media >>>> types. So, WiSH media type would trigger the preflight unless we exclude it. >>>> >>>> Origin policy https://wicg.github.io/origin-policy/ might also help. >>>> >>>> >>>> >>>> Costin >>>> >>>> On Fri, Oct 28, 2016 at 12:06 PM Takeshi Yoshino <tyoshino@google.com> >>>> wrote: >>>> >>>> Sorry for being ambivalent. >>>> >>>> We can of course revisit each design decision we made for RFC 6455 >>>> framing and search for the optimal again. But as: >>>> - one of the main philosophies behind WiSH is compatibility with >>>> WebSocket in terms of both spec and implementation >>>> - the WebSocket is widely deployed and therefore we have a lot of >>>> implementations in various languages/platform >>>> - most browsers already have logic for the framing >>>> - the framing is not considered to be so big pain >>>> inheriting the WebSocket framing almost as-is is just good enough. >>>> Basically, I'm leaning toward this plan. >>>> >>>> Takeshi >>>> >>>> On Sat, Oct 29, 2016 at 3:12 AM, Takeshi Yoshino <tyoshino@google.com> >>>> wrote: >>>> >>>> On Sat, Oct 29, 2016 at 2:55 AM, Loïc Hoguin <essen@ninenines.eu> >>>> wrote: >>>> >>>> On 10/28/2016 08:41 PM, Costin Manolache wrote: >>>> >>>> Current overhead is 2 bytes if frame is up to 125 bytes long - which I >>>> think it's not very common, >>>> 4 bytes for up to 64k, and 10 bytes for anything larger. >>>> IMHO adding one byte - i.e. making it fixed 5-byte, with first as is, >>>> and next 4 fixed length would >>>> be easiest to parse. >>>> >>>> >>>> Is making it easy (or easier) to parse even a concern anymore? >>>> >>>> Considering the number of agents and servers already supporting >>>> Websocket, the numerous libraries for nearly all languages and the great >>>> autobahntestsuite project validating it all, reusing the existing code is a >>>> very sensible solution. >>>> >>>> >>>> Yeah, I've been having similar feeling regarding cost for >>>> parser/encoder implementation though I might be biased. >>>> >>>> >>>> There are obviously too many options to encode and each has benefits - >>>> my only concern was >>>> that the choice of 1, 2, 8 bytes for length may not match common sizes. >>>> >>>> ( in webpush frames will be <4k ). >>>> >>>> >>>> -- >>>> Loïc Hoguin >>>> https://ninenines.eu >>>> >>>> >>>> >>>> >>>> >> >
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- WiSH: A General Purpose Message Framing over Byte… Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Loïc Hoguin
- Re: WiSH: A General Purpose Message Framing over … Van Catha
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Loïc Hoguin
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Loïc Hoguin
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Wenbo Zhu
- Re: WiSH: A General Purpose Message Framing over … Wenbo Zhu
- Re: WiSH: A General Purpose Message Framing over … Loïc Hoguin
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Costin Manolache
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Wenbo Zhu
- Re: WiSH: A General Purpose Message Framing over … Costin Manolache
- Re: WiSH: A General Purpose Message Framing over … Costin Manolache
- Re: WiSH: A General Purpose Message Framing over … Loïc Hoguin
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Wenbo Zhu
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Van Catha
- Re: WiSH: A General Purpose Message Framing over … Costin Manolache
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Costin Manolache
- Re: WiSH: A General Purpose Message Framing over … Wenbo Zhu
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Costin Manolache
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Van Catha
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Van Catha
- Re: WiSH: A General Purpose Message Framing over … Mark Nottingham
- Re: WiSH: A General Purpose Message Framing over … Andy Green
- Re: WiSH: A General Purpose Message Framing over … Mark Nottingham
- Re: WiSH: A General Purpose Message Framing over … Andy Green
- Re: WiSH: A General Purpose Message Framing over … Mark Nottingham
- Re: WiSH: A General Purpose Message Framing over … Willy Tarreau
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino
- Re: WiSH: A General Purpose Message Framing over … Mark Nottingham
- Re: WiSH: A General Purpose Message Framing over … Van Catha
- Re: WiSH: A General Purpose Message Framing over … Poul-Henning Kamp
- RE: WiSH: A General Purpose Message Framing over … Mike Bishop
- Re: WiSH: A General Purpose Message Framing over … Van Catha
- Re: WiSH: A General Purpose Message Framing over … Andy Green
- Re: WiSH: A General Purpose Message Framing over … Van Catha
- Re: WiSH: A General Purpose Message Framing over … Andy Green
- Re: WiSH: A General Purpose Message Framing over … Martin J. Dürst
- Re: WiSH: A General Purpose Message Framing over … Alexey Melnikov
- Re: WiSH: A General Purpose Message Framing over … Takeshi Yoshino