2021-02-26 2023-06-13 provisional Expert Review provisional registration date field update First Come First Served permanent, 0x00-0x3f Standards Action or IESG Approval permanent, greater than 0x3f Specification Required values 0x1f * N + 0x21 (for non-negative integer values of N) Reserved first unassigned codepoint Standards Action Mike Bishop, Alan Frindell 0x00 DATA permanent RFC9114, Section 7.2.1 2021-02-26 IETF 0x01 HEADERS permanent RFC9114, Section 7.2.2 2021-02-26 IETF 0x02 Reserved 2021-02-26 0x03 CANCEL_PUSH permanent RFC9114, Section 7.2.3 2021-02-26 IETF 0x04 SETTINGS permanent RFC9114, Section 7.2.4 2021-02-26 IETF 0x05 PUSH_PROMISE permanent RFC9114, Section 7.2.5 2021-02-26 IETF 0x06 Reserved 0x07 GOAWAY permanent RFC9114, Section 7.2.6 2021-02-26 IETF 0x08-0x09 Reserved 0x0a-0x0b Unassigned 0x0c ORIGIN permanent RFC9412, Section 2 2023-03-14 IETF 0x0d MAX_PUSH_ID permanent RFC9114, Section 7.2.7 2021-02-26 IETF 0x0e-0x4c Unassigned 0x4d METADATA provisional 2022-08-26 0xf0700-0xf0701 PRIORITY_UPDATE permanent 2022-01-25 IETF provisional Expert Review provisional registration date field update First Come First Served permanent, 0x00-0x3f Standards Action or IESG Approval permanent, greater than 0x3f Specification Required values 0x1f * N + 0x21 (for non-negative integer values of N) Reserved first unassigned codepoint Standards Action Mike Bishop, Alan Frindell 0x00 Reserved N/A 0x01 SETTINGS_QPACK_MAX_TABLE_CAPACITY 0 permanent RFC9204, Section 5 2021-03-16 IETF 0x02 Reserved N/A 0x03 Reserved N/A 0x04 Reserved N/A 0x05 Reserved N/A 0x06 SETTINGS_MAX_FIELD_SECTION_SIZE Unlimited permanent RFC9114, Section 7.2.4.1 2021-02-26 IETF 0x07 SETTINGS_QPACK_BLOCKED_STREAMS 0 permanent RFC9204, Section 5 2021-03-16 IETF 0x08 SETTINGS_ENABLE_CONNECT_PROTOCOL 0 permanent 2022-02-11 IETF 0x33 SETTINGS_H3_DATAGRAM 0 permanent 2022-06-23 IETF 0x4d44 SETTINGS_ENABLE_METADATA 0 provisional 2022-08-26 provisional Expert Review provisional registration date field update First Come First Served permanent, 0x00-0x3f Standards Action or IESG Approval permanent, greater than 0x3f Specification Required values 0x1f * N + 0x21 (for non-negative integer values of N) Reserved first unassigned codepoint Standards Action Mike Bishop, Alan Frindell 0x33 H3_DATAGRAM_ERROR Datagram or Capsule Protocol parse error permanent 2022-06-23 IETF 0x0100 H3_NO_ERROR No error permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0101 H3_GENERAL_PROTOCOL_ERROR General protocol error permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0102 H3_INTERNAL_ERROR Internal error permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0103 H3_STREAM_CREATION_ERROR Stream creation error permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0104 H3_CLOSED_CRITICAL_STREAM Critical stream was closed permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0105 H3_FRAME_UNEXPECTED Frame not permitted in the current state permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0106 H3_FRAME_ERROR Frame violated layout or size rules permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0107 H3_EXCESSIVE_LOAD Peer generating excessive load permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0108 H3_ID_ERROR An identifier was used incorrectly permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0109 H3_SETTINGS_ERROR SETTINGS frame contained invalid values permanent RFC9114, Section 8.1 2021-02-26 IETF 0x010a H3_MISSING_SETTINGS No SETTINGS frame received permanent RFC9114, Section 8.1 2021-02-26 IETF 0x010b H3_REQUEST_REJECTED Request not processed permanent RFC9114, Section 8.1 2021-02-26 IETF 0x010c H3_REQUEST_CANCELLED Data no longer needed permanent RFC9114, Section 8.1 2021-02-26 IETF 0x010d H3_REQUEST_INCOMPLETE Stream terminated early permanent RFC9114, Section 8.1 2021-02-26 IETF 0x010e H3_MESSAGE_ERROR Malformed message permanent RFC9114, Section 8.1 2021-02-26 IETF 0x010f H3_CONNECT_ERROR TCP reset or error on CONNECT request permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0110 H3_VERSION_FALLBACK Retry over HTTP/1.1 permanent RFC9114, Section 8.1 2021-02-26 IETF 0x0200 QPACK_DECOMPRESSION_FAILED Decoding of a field section failed permanent RFC9204, Section 6 2021-03-16 IETF 0x0201 QPACK_ENCODER_STREAM_ERROR Error on the encoder stream permanent RFC9204, Section 6 2021-03-16 IETF 0x0202 QPACK_DECODER_STREAM_ERROR Error on the decoder stream permanent RFC9204, Section 6 2021-03-16 IETF provisional Expert Review provisional registration date field update First Come First Served permanent, 0x00-0x3f Standards Action or IESG Approval permanent, greater than 0x3f Specification Required values 0x1f * N + 0x21 (for non-negative integer values of N) Reserved first unassigned codepoint Standards Action Mike Bishop, Alan Frindell 0x00 Control Stream Both permanent RFC9114, Section 6.2.1 2021-02-26 IETF 0x01 Push Stream Server permanent RFC9114, Section 4.4 2021-02-26 IETF 0x02 QPACK Encoder Stream Both permanent RFC9204, Section 4.2 2021-03-16 IETF 0x03 QPACK Decoder Stream Both permanent RFC9204, Section 4.2 2021-03-16 IETF Bence Beky mailto:bnc&google.com 2022-08-26 HTTP working group mailto:ietf-http-wg&w3.org 2023-03-14