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/// Pseudo-header prefix used by HTTP/2 and HTTP/3 header maps.
pub const PSEUDO_HEADER_PREFIX: &str = ":";
/// Size of the buffer used to read a protocol request body chunk by chunk.
pub const PROTOCOL_BODY_CHUNK: usize = 8 * 1024;
/// The character separating the path from the query in a request target.
pub const QUESTION_MARK: char = '?';
/// The header naming the trailers section of a message.
pub const TRAILER_HEADER: &str = "trailer";
/// Buffer size of the duplex pipe joining the pipeline to a protocol stream.
pub const PROTOCOL_STREAM_CAPACITY: usize = 32 * 1024;
/// Maximum size of a serialized response head accepted from the pipeline.
pub const RESPONSE_HEAD_MAX: usize = 16 * 1024;
/// The reason returned when a response head exceeds its bound.
pub const RESPONSE_HEAD_TOO_LONG: &str = "response head exceeds its bound";
/// The reason returned when the pipeline closed without writing a head.
pub const MISSING_RESPONSE_HEAD: &str = "response ended before a head was written";
/// The reason returned when a head announces a transfer coding the framing pump
/// cannot reproduce.
///
/// HTTP/2 and HTTP/3 do not carry a chunked body: the data frames are the
/// framing. Forwarding the chunk size lines as body bytes would hand the client
/// a body it must not have to decode, so the head is refused before any frame is
/// emitted and the stream can be reset with a real error.
pub const UNSUPPORTED_TRANSFER_ENCODING: &str =
"response transfer-encoding is not supported on this protocol";
/// The reason returned when a status line carries no code the protocol allows.
pub const INVALID_RESPONSE_STATUS: &str = "response head has an unusable status code";
/// The reason returned when a header line is not `name: value`.
pub const MALFORMED_RESPONSE_HEADER: &str = "response head has a malformed header line";
/// The reason returned when the body is shorter than the announced length.
pub const TRUNCATED_RESPONSE_BODY: &str =
"response ended before the announced content length arrived";
/// The reason returned when the body runs past the announced length.
pub const OVERFLOWING_RESPONSE_BODY: &str =
"response carried more bytes than the announced content length";
/// The reason returned when a send stream is gone before capacity is granted.
pub const MISSING_SEND_CAPACITY: &str =
"the send stream was closed before capacity was granted";
/// The smallest status code a protocol can carry.
pub const MIN_STATUS_CODE: usize = 100;
/// The largest status code a protocol can carry.
pub const MAX_STATUS_CODE: usize = 999;