object

http_websocket_handshake

Shared helpers for WebSocket opening-handshake key generation and accept-value computation.

Availability:

logtalk_load(http_websocket_handshake(loader))

Author: Paulo Moura

Version: 1:0:0

Date: 2026-06-11

Compilation flags:

static, context_switching_calls

Uses:

base64

crypto

hash_common_32

list

Remarks:

(none)

Inherited public predicates:

(none)

Public predicates

websocket_opening_key/1

Generates a canonical base64-encoded 16-byte WebSocket opening key.

Compilation flags:

static

Template:

websocket_opening_key(Key)

Mode and number of proofs:

websocket_opening_key(--atom) - one

---

websocket_accept/2

Computes the canonical Sec-WebSocket-Accept value for a valid WebSocket opening key.

Compilation flags:

static

Template:

websocket_accept(Key,Accept)

Mode and number of proofs:

websocket_accept(++term,--atom) - one_or_error

Exceptions:

Key is a variable:

instantiation_error

Key is not a valid WebSocket opening key value:

domain_error(http_websocket_key,Key)

---

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)