Function parseALPN

internal/proxy/parser.go:823–843

parseALPN extracts protocol names from ALPN extension.

(data []byte)

// parseALPN extracts protocol names from ALPN extension.
func parseALPN(data []byte) []string {
	if len(data) < 2 {
		return nil
	}

	// List length (2 bytes)
	offset := 2
	var protocols []string

	for offset < len(data) {
		protoLen := int(data[offset])
		offset++
		if offset+protoLen > len(data) {
			break
		}
		protocols = append(protocols, string(data[offset:offset+protoLen]))
		offset += protoLen
	}

	return protocols
}

// readVarInt reads a QUIC variable-length integer.
func readVarInt(data []byte) (uint64, int, error) {