Re: [quicwg/base-drafts] Semantics of SETTINGS_MAX_HEADER_LIST_SIZE (#2516)

Lucas Pardue <> Wed, 13 March 2019 21:22 UTC

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From: Lucas Pardue <>
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Subject: Re: [quicwg/base-drafts] Semantics of SETTINGS_MAX_HEADER_LIST_SIZE (#2516)
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An optional limit that's rarely enforced and, perhaps worse, unpredictably enforced seems like a waste of a limit. 

Implementations already have limits on the size of individual headers, which trigger semantic layer errors. Why does the sum total need to trigger a syntax type of error?

Enforcing error makes this stricter than H2, hurting interoperability between implementations that support H3 and H2 at the same time. 

Speculating, I can see this causing some strange issues in the wild, where clients Alt-Svc up to H3, encounter a sporadic error and then purge H3 endpoints from their Alt-Svc cache. 

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