Re: [quicwg/base-drafts] Simplify SETTINGS payload (#1807)

Mike Bishop <> Thu, 27 September 2018 23:10 UTC

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From: Mike Bishop <>
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Subject: Re: [quicwg/base-drafts] Simplify SETTINGS payload (#1807)
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MikeBishop commented on this pull request.

> @@ -1478,6 +1469,12 @@ SETTINGS_MAX_FRAME_SIZE:
 : See {{settings-parameters}}.
+In HTTP/QUIC, setting values are variable-length integers (6, 14, 30, or 62 bits
+long) rather than fixed-length 32-bit fields.  This will often produce a shorter
+encoding, but will produce a longer encoding for settings which use the full
+32-bit space.  Settings ported from HTTP/2 might choose to redefine the format
+of their settings to avoid using the 62-bit encoding.

Secondary Certs currently stuffs an exporter in the setting value (to confirm both peers are on the same TLS connection with no MitM), and would overflow to an eight-byte field.  It doesn't *require* changes, but it's advisable to either take advantage of the entire eight bytes or trim two bits off to still fit in four bytes.  Hence, "might choose."

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