Re: [quicwg/base-drafts] Placeholder limits make for awkward clients (#2734)

Kazuho Oku <> Fri, 31 May 2019 05:28 UTC

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From: Kazuho Oku <>
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Subject: Re: [quicwg/base-drafts] Placeholder limits make for awkward clients (#2734)
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@afrind I think there are three choices:
* a) require some servers to lie (send non-zero SETTINGS_NUM_PLACEHOLDERS even though they do not respect placeholders)
* b) require all clients to build different trees based on the value of SETTINGS_NUM_PLACEHOLDERS
* c) let the clients send placeholders out of the server's advertised range

I do not think _a_ is a good idea, because we'd be losing some signal. _b_ is what we have now, but seems like an unnecessary complexity considering the fact that some servers might still ignore placeholders (or the priority tree as a whole). To me _c_ seems to be a good middle ground. Clients that want to respect SETTINGS_NUM_PLACEHOLDERS can do so, but that becomes an option. Hence #2761.

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