Internet Assigned Numbers Authority

Hypertext Transfer Protocol version 2 (HTTP/2) Parameters

Created
2015-02-20
Last Updated
2022-08-17
Available Formats

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Registries included below

HTTP/2 Frame Type

Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC9113]
Available Formats

CSV
Code Frame Type Reference
0x00 DATA [RFC9113, Section 6.1]
0x01 HEADERS [RFC9113, Section 6.2]
0x02 PRIORITY [RFC9113, Section 6.3]
0x03 RST_STREAM [RFC9113, Section 6.4]
0x04 SETTINGS [RFC9113, Section 6.5]
0x05 PUSH_PROMISE [RFC9113, Section 6.6]
0x06 PING [RFC9113, Section 6.7]
0x07 GOAWAY [RFC9113, Section 6.8]
0x08 WINDOW_UPDATE [RFC9113, Section 6.9]
0x09 CONTINUATION [RFC9113, Section 6.10]
0x0a ALTSVC [RFC7838, Section 4]
0x0b Unassigned
0x0c ORIGIN [RFC8336]
0x0d-0x0f Unassigned
0x10 PRIORITY_UPDATE [RFC9218]
0x11-0xff Unassigned

HTTP/2 Settings

Registration Procedure(s)
Expert Review
Expert(s)
Martin Thomson (primary), Julian Reschke (secondary)
Reference
[RFC9113]
Available Formats

CSV
Code Name Initial Value Reference
0x00 Reserved [RFC9113]
0x01 HEADER_TABLE_SIZE 4096 [RFC9113, Section 6.5.2]
0x02 ENABLE_PUSH 1 [RFC9113, Section 6.5.2]
0x03 MAX_CONCURRENT_STREAMS (infinite) [RFC9113, Section 6.5.2]
0x04 INITIAL_WINDOW_SIZE 65535 [RFC9113, Section 6.5.2]
0x05 MAX_FRAME_SIZE 16384 [RFC9113, Section 6.5.2]
0x06 MAX_HEADER_LIST_SIZE (infinite) [RFC9113, Section 6.5.2]
0x07 Unassigned
0x08 SETTINGS_ENABLE_CONNECT_PROTOCOL 0 [RFC8441]
0x09 SETTINGS_NO_RFC7540_PRIORITIES 0 [RFC9218]
0x0a-0x0f Unassigned
0x10 TLS_RENEG_PERMITTED 0x00 [MS-HTTP2E][Gabriel_Montenegro]
0x11-0x4d43 Unassigned
0x4d44 SETTINGS_ENABLE_METADATA 0 [draft-beky-httpbis-metadata-02]
0x4d45-0xffff Unassigned

HTTP/2 Error Code

Registration Procedure(s)
Expert Review
Expert(s)
Martin Thomson (primary), Julian Reschke (secondary)
Reference
[RFC9113]
Available Formats

CSV
Code Name Description Reference
0x00 NO_ERROR Graceful shutdown [RFC9113, Section 7]
0x01 PROTOCOL_ERROR Protocol error detected [RFC9113, Section 7]
0x02 INTERNAL_ERROR Implementation fault [RFC9113, Section 7]
0x03 FLOW_CONTROL_ERROR Flow-control limits exceeded [RFC9113, Section 7]
0x04 SETTINGS_TIMEOUT Settings not acknowledged [RFC9113, Section 7]
0x05 STREAM_CLOSED Frame received for closed stream [RFC9113, Section 7]
0x06 FRAME_SIZE_ERROR Frame size incorrect [RFC9113, Section 7]
0x07 REFUSED_STREAM Stream not processed [RFC9113, Section 7]
0x08 CANCEL Stream cancelled [RFC9113, Section 7]
0x09 COMPRESSION_ERROR Compression state not updated [RFC9113, Section 7]
0x0a CONNECT_ERROR TCP connection error for CONNECT method [RFC9113, Section 7]
0x0b ENHANCE_YOUR_CALM Processing capacity exceeded [RFC9113, Section 7]
0x0c INADEQUATE_SECURITY Negotiated TLS parameters not acceptable [RFC9113, Section 7]
0x0d HTTP_1_1_REQUIRED Use HTTP/1.1 for the request [RFC9113, Section 7]
0x0e-0xffffffff Unassigned

Contact Information

ID Name Contact URI Last Updated
[Gabriel_Montenegro] Gabriel_Montenegro mailto:gabriel.montenegro&microsoft.com 2018-08-02