Zabbix Documentation 4.2

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manual:appendix:protocols:header_datalen

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3 Header and data length

Overview

Header and data length is present in response and request messages between zabbix components, it is required to determine end of message.

<HEADER> - "ZBXD\x01" (5 bytes)
<DATALEN> - data length (8 bytes). 1 will be formatted as 01/00/00/00/00/00/00/00 (eight bytes, 64 bit number in little-endian format)

To not exhaust memory (potentially) Zabbix server is limited to accept only 128MB in one connection when using the Zabbix protocol.