# Macros

NGHTTP2_VERSION

  Version number of the nghttp2 library release

NGHTTP2_VERSION_NUM

  Numerical representation of the version number of the nghttp2 library release. This is a 24 bit number with 8 bits for major number, 8 bits for minor and 8 bits for patch. Version 1.2.3 becomes 0x010203.

NGHTTP2_PROTO_VERSION_ID

  The protocol version identification string of this library supports. This identifier is used if HTTP/2 is used over TLS.

NGHTTP2_PROTO_VERSION_ID_LEN

  The length of `NGHTTP2_PROTO_VERSION_ID`.

NGHTTP2_PROTO_ALPN

  The serialized form of ALPN protocol identifier this library supports. Notice that first byte is the length of following protocol identifier. This is the same wire format of TLS ALPN extension. This is useful to process incoming ALPN tokens in wire format.

NGHTTP2_PROTO_ALPN_LEN

  The length of `NGHTTP2_PROTO_ALPN`.

NGHTTP2_CLEARTEXT_PROTO_VERSION_ID

  The protocol version identification string of this library supports. This identifier is used if HTTP/2 is used over cleartext TCP.

NGHTTP2_CLEARTEXT_PROTO_VERSION_ID_LEN

  The length of `NGHTTP2_CLEARTEXT_PROTO_VERSION_ID`.

NGHTTP2_VERSION_AGE

  The age of `nghttp2_info`

NGHTTP2_DEFAULT_WEIGHT

  Warning

  Deprecated. RFC 7540 priorities are deprecated by RFC 9113. Consider migrating to RFC 9218 extensible prioritization scheme.

  The default weight of stream dependency.

NGHTTP2_MAX_WEIGHT

  Warning

  Deprecated. RFC 7540 priorities are deprecated by RFC 9113. Consider migrating to RFC 9218 extensible prioritization scheme.

  The maximum weight of stream dependency.

NGHTTP2_MIN_WEIGHT

  Warning

  Deprecated. RFC 7540 priorities are deprecated by RFC 9113. Consider migrating to RFC 9218 extensible prioritization scheme.

  The minimum weight of stream dependency.

NGHTTP2_MAX_WINDOW_SIZE

  The maximum window size

NGHTTP2_INITIAL_WINDOW_SIZE

  The initial window size for stream level flow control.

NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE

  The initial window size for connection level flow control.

NGHTTP2_DEFAULT_HEADER_TABLE_SIZE

  The default header table size.

NGHTTP2_CLIENT_MAGIC

  The client magic string, which is the first 24 bytes byte string of client connection preface.

NGHTTP2_CLIENT_MAGIC_LEN

  The length of `NGHTTP2_CLIENT_MAGIC`.

NGHTTP2_DEFAULT_MAX_SETTINGS

  The default max number of settings per SETTINGS frame

NGHTTP2_INITIAL_MAX_CONCURRENT_STREAMS

  Warning

  Deprecated. The initial max concurrent streams is 0xffffffffu.

  Default maximum number of incoming concurrent streams. Use `nghttp2_submit_settings()` with `nghttp2_settings_id.NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS` to change the maximum number of incoming concurrent streams.

  Note

  The maximum number of outgoing concurrent streams is 100 by default.

NGHTTP2_EXTPRI_DEFAULT_URGENCY

  `NGHTTP2_EXTPRI_DEFAULT_URGENCY` is the default urgency level for RFC 9218 extensible priorities.

NGHTTP2_EXTPRI_URGENCY_HIGH

  `NGHTTP2_EXTPRI_URGENCY_HIGH` is the highest urgency level for RFC 9218 extensible priorities.

NGHTTP2_EXTPRI_URGENCY_LOW

  `NGHTTP2_EXTPRI_URGENCY_LOW` is the lowest urgency level for RFC 9218 extensible priorities.

NGHTTP2_EXTPRI_URGENCY_LEVELS

  `NGHTTP2_EXTPRI_URGENCY_LEVELS` is the number of urgency levels for RFC 9218 extensible priorities.