QUIC uses only one static table of Huffman coding, but the compression ratio can be improved by combining multiple tables. The following is a comparison based on my proof of concept code. The leftmost number is the reduced bit size.
'XPACK comp. ratio request', 0.2533415841584158, 1.3393005138405436 'HPACK comp. ratio request', 0.2471534653465347, 1.3282919612033537 0, 'accept' 0, 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7' 0, 'accept-encoding' 0, 'gzip, deflate, br' 0, 'accept-language' 0, 'ja,en-US;q=0.9,en;q=0.8' 0, 'cache-control' 0, 'max-age=0' 0, 'dnt' 0, '1' 0, 'sec-ch-ua' -1, '"Google Chrome";v="117", "Not;A=Brand";v="8", "Chromium";v="117"' 0, 'sec-ch-ua-arch' 0, '"x86"' 0, 'sec-ch-ua-bitness' 0, '"64"' 0, 'sec-ch-ua-full-version' 0, '"117.0.5938.89"' 0, 'sec-ch-ua-full-version-list' -1, '"Google Chrome";v="117.0.5938.89", "Not;A=Brand";v="8.0.0.0", "Chromium";v="117.0.5938.89"' 0, 'sec-ch-ua-mobile' 0, '?0' 0, 'sec-ch-ua-model' 0, '""' 0, 'sec-ch-ua-platform' 0, '"Windows"' 0, 'sec-ch-ua-platform-version' 0, '"10.0.0"' 0, 'sec-ch-ua-wow64' 0, '?0' 0, 'sec-fetch-dest' 0, 'document' 0, 'sec-fetch-mode' 0, 'navigate' 0, 'sec-fetch-site' 0, 'same-origin' 0, 'sec-fetch-user' 0, '?1' 0, 'sec-gpc' 0, '1' 0, 'upgrade-insecure-requests' 0, '1' 0, 'user-agent' -3, 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36' 0, 'x-client-data' -45, 'CKa1yQEIj7bJAQiltskBCKmdygEI5tTKAQieicsBCJahywEIhaDNAQjwsc0BCNy9zQEI38TNAQi1xc0BCLnKzQEI1dDNAQiR0s0BCIrTzQEIwtTNAQjJ1s0BCPnA1BUYwcvMARi4v80B' 'XPACK comp. ratio response', 0.25389886578449905, 1.340300870942201 'HPACK comp. ratio response', 0.24155245746691867, 1.3184827478775605 0, 'accept-ch' -2, 'Sec-CH-UA-Arch' 0, 'accept-ch' -2, 'Sec-CH-UA-Bitness' 0, 'accept-ch' -2, 'Sec-CH-UA-Full-Version' 0, 'accept-ch' -2, 'Sec-CH-UA-Full-Version-List' 0, 'accept-ch' -2, 'Sec-CH-UA-Model' 0, 'accept-ch' -2, 'Sec-CH-UA-Platform' 0, 'accept-ch' -2, 'Sec-CH-UA-Platform-Version' 0, 'accept-ch' -1, 'Sec-CH-UA-WoW64' 0, 'alt-svc' 0, 'h3=":443"; ma=2592000,h3-29=":443"; ma=2592000' 0, 'cache-control' 0, 'private, max-age=0' 0, 'content-encoding' 0, 'br' 0, 'content-length' 0, '54188' 0, 'content-security-policy-report-only' -2, 'object-src 'none';base-uri 'self';script-src 'nonce-OqX2tRcsQ42YI77KwfGMfg' 'strict-dynamic' 'report-sample' 'unsafe-eval' 'unsafe-inline' https' 0, 'http:;report-uri https://csp.withgoogle.com/csp/gws/other-hp' 0, 'content-type' -1, 'text/html; charset=UTF-8' 0, 'cross-origin-opener-policy' 0, 'same-origin-allow-popups; report-to="gws"' 0, 'date' -2, 'Wed, 22 Nov 2023 18:46:19 GMT' 0, 'expires' 0, '-1' 0, 'origin-trial' -50, 'Ap+qNlnLzJDKSmEHjzM5ilaa908GuehlLqGb6ezME5lkhelj20qVzfv06zPmQ3LodoeujZuphAolrnhnPA8w4AIAAABfeyJvcmlnaW4iOiJodHRwczovL3d3dy5nb29nbGUuY29tOjQ0MyIsImZlYXR1cmUiOiJQZXJtaXNzaW9uc1BvbGljeVVubG9hZCIsImV4cGlyeSI6MTY4NTY2Mzk5OX0=' 0, 'origin-trial' -83, 'AvudrjMZqL7335p1KLV2lHo1kxdMeIN0dUI15d0CPz9dovVLCcXk8OAqjho1DX4s6NbHbA/AGobuGvcZv0drGgQAAAB9eyJvcmlnaW4iOiJodHRwczovL3d3dy5nb29nbGUuY29tOjQ0MyIsImZlYXR1cmUiOiJCYWNrRm9yd2FyZENhY2hlTm90UmVzdG9yZWRSZWFzb25zIiwiZXhwaXJ5IjoxNjkxNTM5MTk5LCJpc1N1YmRvbWFpbiI6dHJ1ZX0=' 0, 'p3p' -2, 'CP="This is not a P3P policy! See g.co/p3phelp for more info."' 0, 'permissions-policy' 0, 'unload=()' 0, 'report-to' 0, '{"group":"gws","max_age":2592000,"endpoints":[{"url":"https://csp.withgoogle.com/csp/report-to/gws/other"}]}' 0, 'server' 0, 'gws' 0, 'set-cookie' 0, '1P_JAR=2023-11-22-18; expires=Fri, 22-Dec-2023 18:46:19 GMT; path=/; domain=.google.com; Secure; SameSite=none' 0, 'set-cookie' -23, 'AEC=Ackid1QH6gVXB6Rn68KWRmRtOGSW1unAfUHYsxuZh3Zs8cyWCZdKy8vrhQ; expires=Mon, 20-May-2024 18:46:19 GMT; path=/; domain=.google.com; Secure; HttpOnly; SameSite=lax' 0, 'set-cookie' -19, 'NID=511=fx_DiN-XffVTX7QHZe7UgP5GQd0mx2HY9B0Hz6MgzEpOESnD8DldcSLyj-U6AHIo8t4-dcOKelciAyOK2j03GJE1r_31zKvXnECnKWvOQiFPO6mtTTaCZWqtn2x8m5lnzbB_CyUA-HzXz-Vw3TXC0eeW_AQlcu8CybBgyxtW5Kc; expires=Thu, 23-May-2024 18:46:19 GMT; path=/; domain=.google.com; Secure; HttpOnly; SameSite=none' 0, 'strict-transport-security' 0, 'max-age=31536000' 0, 'x-frame-options' -12, 'SAMEORIGIN' 0, 'x-xss-protection' 0, '0' https://github.com/falsandtru/spica/blob/master/src/ascii.xpack.ts This is particularly good at compressing tokens. There is no overhead in data size due to the combination. If this approach has been considered, please tell me the link to the conclusions.
