longbridge__developers/i18n/en/docusaurus-plugin-content-docs/current/api-reference/socket/protocol/how-to-parse-header.md

title, id, slug, sidebar_position

title	id	slug	sidebar_position
Parse Header of Packet	how-to-parse-header	/socket/protocol/header	3

We have three type packet:

• request
• response
• push

The type of packet and some other info can decide the length of packet. Then length of Header is 1 byte.

:::info The length of Header is 1 byte. :::

Structure

 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
|  type |v|g|re.|
+-+-+-+-+-+-+-+-+

Field	Length in bit	description
type	4	packet type: 1 - request 2 - resopnse 3 - push
verify	1	if have signature data 0 - Yes 1 - No
gzip	1	if use gzip to compress data: 1 - Yes 0 - No
reserve	2	reversed

Example

// reserve - 0, gzip - 0, verify - 0,  type - 1
0b 0000 0001

// reserve - 0, gzip - 1, verify - 0, type - 2
0b 0011 0010

// reserve - 0, gzip - 1, verify - 1, type - 3
0b 0001 0011


//  reserve - 3, gzip - 1, verify - 0, type - 3
0b 1110 0011