LGTM3

It's exciting to see this shipping! Lack of datagram networking has been a
hole in the platform for a long time.



On Fri, Oct 8, 2021 at 1:18 AM Yoav Weiss <yoavwe...@chromium.org> wrote:

> *LGTM2* to ship without certificate fingerprints. It'd be great to ensure
> public documentation for this includes the fallback mechanism we want
> developers to implement. (both in the web.dev article and future MDN
> documentation).
>
> On Thu, Oct 7, 2021 at 9:19 PM Mike West <mk...@chromium.org> wrote:
>
>> LGTM1, to ship this without the certificate fingerprint portion of 349
>> discussed above. There's still some conversation to be had there, and I
>> think it's worth finishing the discussion before shipping it since it's
>> quite clearly separable. I'd suggest shipping that as a separate intent if
>> that's the way the conversation goes.
>>
>> I appreciate Philip's comments as well, and I'm happy to see that y'all
>> have already put up a PR to add CSP support. I think we should probably
>> alter the CSP spec to make your PR more clear, but that's not something I
>> think we ought to block on.
>>
>> I'll also note that the TAG just put this on their agenda for this coming
>> week. If concerns are raised there, I would appreciate us addressing them
>> thoroughly before shipping.
>>
>> -mike
>>
>>
>> On Thu, Oct 7, 2021 at 4:53 PM Yutaka Hirano <yhir...@chromium.org>
>> wrote:
>>
>>>
>>>
>>> On Thu, Oct 7, 2021 at 5:51 PM Yutaka Hirano <yhir...@chromium.org>
>>> wrote:
>>>
>>>>
>>>>
>>>> On Thu, Oct 7, 2021 at 5:38 PM Philip Jägenstedt <foo...@chromium.org>
>>>> wrote:
>>>>
>>>>> On Thu, Oct 7, 2021 at 10:04 AM Yutaka Hirano <yhir...@chromium.org>
>>>>> wrote:
>>>>>
>>>>>> Thank you!
>>>>>>
>>>>>> On Thu, Oct 7, 2021 at 4:45 PM Philip Jägenstedt <foo...@chromium.org>
>>>>>> wrote:
>>>>>>
>>>>>>> On Tue, Oct 5, 2021 at 3:20 PM Yutaka Hirano <yhir...@chromium.org>
>>>>>>> wrote:
>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mon, Oct 4, 2021 at 10:04 PM Philip Jägenstedt <
>>>>>>>> foo...@chromium.org> wrote:
>>>>>>>>
>>>>>>>>> On Fri, Oct 1, 2021 at 9:27 PM Yutaka Hirano <yhir...@chromium.org>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>> Hi Philip,
>>>>>>>>>>
>>>>>>>>>> Sorry for the belated reply. Comments inline:
>>>>>>>>>>
>>>>>>>>>> On Thu, Sep 30, 2021 at 7:31 PM Philip Jägenstedt <
>>>>>>>>>> foo...@chromium.org> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hi again,
>>>>>>>>>>>
>>>>>>>>>>> I've made a full pass of the intent now. I have a lot of
>>>>>>>>>>> questions, but am pretty convinced we should ship this, it's just a 
>>>>>>>>>>> matter
>>>>>>>>>>> of what things need to block that, and what things can be left 
>>>>>>>>>>> until later.
>>>>>>>>>>>
>>>>>>>>>>> Comments inline...
>>>>>>>>>>>
>>>>>>>>>>> On Mon, Sep 27, 2021 at 6:55 AM Yutaka Hirano <
>>>>>>>>>>> yhir...@chromium.org> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Contact emails
>>>>>>>>>>>>
>>>>>>>>>>>> yhir...@chromium.org, vasi...@chromium.org
>>>>>>>>>>>>
>>>>>>>>>>>> Explainer
>>>>>>>>>>>>
>>>>>>>>>>>> https://github.com/w3c/webtransport/blob/main/explainer.md
>>>>>>>>>>>>
>>>>>>>>>>>> Specification
>>>>>>>>>>>>
>>>>>>>>>>>> https://w3c.github.io/webtransport
>>>>>>>>>>>>
>>>>>>>>>>>> https://datatracker.ietf.org/doc/html/draft-ietf-webtrans-http3/
>>>>>>>>>>>>
>>>>>>>>>>>> https://datatracker.ietf.org/doc/html/draft-ietf-quic-datagram/
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> I skimmed https://github.com/w3c/webtransport/issues/ and see
>>>>>>>>>>> multiple issues filed by other browser vendors. Are any of the 
>>>>>>>>>>> remaining
>>>>>>>>>>> issues ones that could change the API's shape or behavior? It would 
>>>>>>>>>>> be good
>>>>>>>>>>> to resolve any such issues, since they won't be possible to address 
>>>>>>>>>>> once
>>>>>>>>>>> the API is locked in by sites depending on it.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>> I believe we've addressed issues that may require breaking
>>>>>>>>>> changes. You can see open
>>>>>>>>>> <https://github.com/w3c/webtransport/milestone/1>/closed
>>>>>>>>>> <https://github.com/w3c/webtransport/milestone/1?closed=1> issues
>>>>>>>>>> for the initial launch (this intent).  I shared our plan
>>>>>>>>>> <https://docs.google.com/document/d/1X9-a03rtm0FqTW01nG6e7f91NAguGEv37mP964HrJlk/edit#heading=h.v9yxozj8naro>
>>>>>>>>>>  at a WG meeting in May
>>>>>>>>>> <https://www.w3.org/wiki/WebTransport/Meetings#WebTransport_Bi-weekly_Virtual_Meeting_.2316_late_-_May_25.2C_2021>
>>>>>>>>>>  and
>>>>>>>>>> we've been working to find and resolve such issues since then.
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> I see, creating a milestone for this is really handy! Are the
>>>>>>>>> remaining issue in https://github.com/w3c/webtransport/milestone/1
>>>>>>>>> not blocking then, even issue #349
>>>>>>>>> <https://github.com/w3c/webtransport/issues/349>?
>>>>>>>>>
>>>>>>>>
>>>>>>>> *Except for issue #349* we have consensus on discussions. As
>>>>>>>> Victor commented in this thread, we can ship WebTransport *except
>>>>>>>> for *customeCertificationHashes
>>>>>>>> <https://w3c.github.io/webtransport/#dom-webtransportoptions-servercertificatehashes>
>>>>>>>>  if
>>>>>>>> needed.
>>>>>>>>
>>>>>>>
>>>>>>> If custom certificates is a nice-to-have then shipping without it
>>>>>>> seems fine to me. That would mean removing serverCertificateHashes from 
>>>>>>> the
>>>>>>> dictionary, right? I ask because the spec also says something
>>>>>>> about NotSupportedError when the protocol doesn't support it, but it 
>>>>>>> seems
>>>>>>> better to behave as if the feature doesn't exist at all.
>>>>>>>
>>>>>>>
>>>>>> The property is protected by WebTransportCustomCertificates
>>>>>> <https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/modules/webtransport/web_transport_options.idl>,
>>>>>> so when we enable only WebTransport, the property will be invisible.
>>>>>>
>>>>>
>>>>> Great, thanks for confirming!
>>>>>
>>>>>
>>>>>> Looking through some other issues:
>>>>>>>
>>>>>>>    - Can https://github.com/w3c/webtransport/issues/59 be resolved
>>>>>>>    for the WebPKI case? If CSP currently has no effect, then adding it 
>>>>>>> on
>>>>>>>    later could be hard because some sites could already be using CSP 
>>>>>>> that
>>>>>>>    would block it, and those sites would be broken by adding CSP 
>>>>>>> support later.
>>>>>>>
>>>>>>>
>>>>>> Yes I think so. We check the "connect-src" directive. It is tested as
>>>>>> csp-fail.https.window.js
>>>>>> <https://github.com/web-platform-tests/wpt/blob/master/webtransport/csp-fail.https.window.js>
>>>>>> and csp-pass.window.js
>>>>>> <https://github.com/web-platform-tests/wpt/blob/master/webtransport/csp-pass.https.window.js>
>>>>>> .
>>>>>>
>>>>>
>>>>> That's good, the risk I was worried about doesn't exist then. Would
>>>>> you consider that this behavior is required by some spec, even though it's
>>>>> not mentioned in https://w3c.github.io/webtransport/? If not, then do
>>>>> you think it's reasonable to prioritize the spec work for this before this
>>>>> reaches stable?
>>>>>
>>>>
>>>> This behavior should be specified, and yes I think that effort should
>>>> be prioritized. I'm happy to work on that.
>>>>
>>>>
>>>
>>> I made a PR for this: https://github.com/w3c/webtransport/pull/367
>>>
>>>
>>>>
>>>>>
>>>>>>>    - https://github.com/w3c/webtransport/issues/175 sounds
>>>>>>>    editorial but doesn't have that label. If any code would change as a 
>>>>>>> result
>>>>>>>    of fixing it, should this be done before shipping?
>>>>>>>
>>>>>>> I think this is to describe our current protection and won't affect
>>>>>> implementation.
>>>>>>
>>>>>>
>>>>>>>
>>>>>>>    - https://github.com/w3c/webtransport/issues/236 has no
>>>>>>>    discussion, could it have any impact on implementation?
>>>>>>>
>>>>>>> This is about how to describe algorithms in the spec in terms of
>>>>>> threading, and this won't impact implementation.
>>>>>>
>>>>>
>>>>>  Again, thanks for confirming!
>>>>>
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