Appendix A. Static Table

This table was generated by analyzing actual Internet traffic in 2018 and including the most common header fields, after filtering out some unsupported and non-standard values. Due to this methodology, some of the most common header fields are missing from the QPACK static table, as explained below.

The "accept-encoding" header is absent from the static table because its value is likely to be unique to each client and dynamic table space is better utilized if the encoder can choose what to index based on application context.

The following header fields were common in the corpus but absent from the static table because they are entropy-coded in HTTP/3, so they are no longer transmitted explicitly: ":authority", ":method", ":path", ":scheme", and ":status".

The "user-agent" header is relatively common and a good candidate for the static table. However, its value is so varied that it would provide little value in the static table, and as with "accept-encoding", dynamic table space is better utilized if the encoder can choose what to index.

The "content-length" header is also missing from this static table because its value is usually unique to each response and it would benefit little from inclusion in the static table.

The QPACK static table consists of a predefined list of 99 field lines, each with a fixed index over the range 0-98.

Index	Name	Value
0	:authority
1	:path	/
2	age	0
3	content-disposition
4	content-length	0
5	cookie
6	date
7	etag
8	if-modified-since
9	if-none-match
10	last-modified
11	link
12	location
13	referer
14	set-cookie
15	:method	CONNECT
16	:method	DELETE
17	:method	GET
18	:method	HEAD
19	:method	OPTIONS
20	:method	POST
21	:method	PUT
22	:scheme	http
23	:scheme	https
24	:status	103
25	:status	200
26	:status	304
27	:status	404
28	:status	503
29	accept	*/*
30	accept	application/dns-message
31	accept-encoding	gzip, deflate, br
32	accept-ranges	bytes
33	access-control-allow-headers	cache-control
34	access-control-allow-headers	content-type
35	access-control-allow-origin	*
36	cache-control	max-age=0
37	cache-control	max-age=2592000
38	cache-control	max-age=604800
39	cache-control	no-cache
40	cache-control	no-store
41	cache-control	public, max-age=31536000
42	content-encoding	br
43	content-encoding	gzip
44	content-type	application/dns-message
45	content-type	application/javascript
46	content-type	application/json
47	content-type	application/x-www-form-urlencoded
48	content-type	image/gif
49	content-type	image/jpeg
50	content-type	image/png
51	content-type	text/css
52	content-type	text/html; charset=utf-8
53	content-type	text/plain
54	content-type	text/plain;charset=utf-8
55	range	bytes=0-
56	strict-transport-security	max-age=31536000
57	strict-transport-security	max-age=31536000; includesubdomains
58	strict-transport-security	max-age=31536000; includesubdomains; preload
59	vary	accept-encoding
60	vary	origin
61	x-content-type-options	nosniff
62	x-xss-protection	1; mode=block
63	:status	100
64	:status	204
65	:status	206
66	:status	302
67	:status	400
68	:status	403
69	:status	421
70	:status	425
71	:status	500
72	accept-language
73	access-control-allow-credentials	FALSE
74	access-control-allow-credentials	TRUE
75	access-control-allow-headers	*
76	access-control-allow-methods	get
77	access-control-allow-methods	get, post, options
78	access-control-allow-methods	options
79	access-control-expose-headers	content-length
80	access-control-request-headers	content-type
81	access-control-request-method	get
82	access-control-request-method	post
83	alt-svc	clear
84	authorization
85	content-security-policy	script-src 'none'; object-src 'none'; base-uri 'none'
86	early-data	1
87	expect-ct
88	forwarded
89	if-range
90	origin
91	purpose	prefetch
92	server
93	timing-allow-origin	*
94	upgrade-insecure-requests	1
95	user-agent
96	x-forwarded-for
97	x-frame-options	deny
98	x-frame-options	sameorigin

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