Enum SettingId

pub enum SettingId {
    HeaderTableSize,
    EnablePush,
    MaxConcurrentStreams,
    InitialWindowSize,
    MaxFrameSize,
    MaxHeaderListSize,
    EnableConnectProtocol,
    Unknown(u16),
}

An enum that lists all valid settings that can be sent in a SETTINGS frame.

Each setting has a value that is a 32 bit unsigned integer (6.5.1.).

See <https://datatracker.ietf.org/doc/html/rfc9113#name-defined-settings.

Variants

HeaderTableSize

This setting allows the sender to inform the remote endpoint of the maximum size of the compression table used to decode field blocks, in units of octets. The encoder can select any size equal to or less than this value by using signaling specific to the compression format inside a field block (see COMPRESSION). The initial value is 4,096 octets.

EnablePush

This setting can be used to enable or disable server push. A server MUST NOT send a PUSH_PROMISE frame if it receives this parameter set to a value of 0; see Section 8.4. A client that has both set this parameter to 0 and had it acknowledged MUST treat the receipt of a PUSH_PROMISE frame as a connection error (Section 5.4.1) of type PROTOCOL_ERROR.

The initial value of SETTINGS_ENABLE_PUSH is 1. For a client, this value indicates that it is willing to receive PUSH_PROMISE frames. For a server, this initial value has no effect, and is equivalent to the value 0. Any value other than 0 or 1 MUST be treated as a connection error (Section 5.4.1) of type PROTOCOL_ERROR.

A server MUST NOT explicitly set this value to 1. A server MAY choose to omit this setting when it sends a SETTINGS frame, but if a server does include a value, it MUST be 0. A client MUST treat receipt of a SETTINGS frame with SETTINGS_ENABLE_PUSH set to 1 as a connection error (Section 5.4.1) of type PROTOCOL_ERROR.

MaxConcurrentStreams

This setting indicates the maximum number of concurrent streams that the sender will allow. This limit is directional: it applies to the number of streams that the sender permits the receiver to create. Initially, there is no limit to this value. It is recommended that this value be no smaller than 100, so as to not unnecessarily limit parallelism.

A value of 0 for SETTINGS_MAX_CONCURRENT_STREAMS SHOULD NOT be treated as special by endpoints. A zero value does prevent the creation of new streams; however, this can also happen for any limit that is exhausted with active streams. Servers SHOULD only set a zero value for short durations; if a server does not wish to accept requests, closing the connection is more appropriate.

InitialWindowSize

This setting indicates the sender’s initial window size (in units of octets) for stream-level flow control. The initial value is 216-1 (65,535) octets.

This setting affects the window size of all streams (see Section 6.9.2).

Values above the maximum flow-control window size of 231-1 MUST be treated as a connection error (Section 5.4.1) of type FLOW_CONTROL_ERROR.

MaxFrameSize

his setting indicates the size of the largest frame payload that the sender is willing to receive, in units of octets.

The initial value is 214 (16,384) octets. The value advertised by an endpoint MUST be between this initial value and the maximum allowed frame size (224-1 or 16,777,215 octets), inclusive. Values outside this range MUST be treated as a connection error (Section 5.4.1) of type PROTOCOL_ERROR.

MaxHeaderListSize

This advisory setting informs a peer of the maximum field section size that the sender is prepared to accept, in units of octets. The value is based on the uncompressed size of field lines, including the length of the name and value in units of octets plus an overhead of 32 octets for each field line.

For any given request, a lower limit than what is advertised MAY be enforced. The initial value of this setting is unlimited.

EnableConnectProtocol

EnableConnectProtocol, if true, enables support for the Extended CONNECT protocol defined in RFC 8441. When enabled, HTTP/2 servers will advertise support for Extended CONNECT. Extended CONNECT requests will include a “:protocol” pseudo header in the request headers.

Unknown(u16)

Implementations

impl SettingId

pub fn is_grease(&self) -> bool

returns true if this id is a grease object

Trait Implementations

impl Clone for SettingId

fn clone(&self) -> SettingId

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SettingId

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SettingId

fn deserialize<D>( deserializer: D, ) -> Result<SettingId, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for SettingId

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl From<u16> for SettingId

fn from(x: u16) -> SettingId

Converts to this type from the input type.

impl<'a> FromIterator<&'a SettingId> for SettingOrder

fn from_iter<T>(iter: T) -> SettingOrder

where T: IntoIterator<Item = &'a SettingId>,

Creates a value from an iterator.

impl FromIterator<SettingId> for SettingOrder

fn from_iter<T>(iter: T) -> SettingOrder

where T: IntoIterator<Item = SettingId>,

Creates a value from an iterator.

impl Hash for SettingId

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl LowerHex for SettingId

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Ord for SettingId

fn cmp(&self, other: &SettingId) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for SettingId

fn eq(&self, other: &SettingId) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for SettingId

fn partial_cmp(&self, other: &SettingId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for SettingId

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl UpperHex for SettingId

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Copy for SettingId

impl Eq for SettingId

impl StructuralPartialEq for SettingId