---
title: Parse Response Packet
id: how-to-parse-response
slug: /socket/protocol/response
sidebar_position: 5
---
One peer need send back a response packet after receiving and handlding request packet.
:::info
Packet type is `2`
:::
## Structure
```
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| type=2|v|g|re.| cmd_code | request_id |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | status_code | body_len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| body_len | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
| body(by body_len) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ nonce(optional) +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ +
| |
+ signature(optional) +
| |
+ +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
```
Fields Descriptions:
| Field | Length in bit | Length in byte | description |
| ---------- | ------------------------------------- | --------------- | ----------------------------------------------------------------------------------------------------- |
| cmd_code | 8 | 1 | Command |
| request_id | 32(uint32) | 4 | Request id, need to be same as request packet for pairing |
| status | 8(uint8) | 1 | status code: `0` - success; others show in [status code table](#status-code-table) |
| body_len | 24(uint32) | 3 | Then length of `body` in bytes.
Max: 16 MB
If gzip is enabled, the value is after compress |
| body | Variable length, decide by `body_len` | variable length | `body`，max size: 16 MB |
| nonce | 64 | 8 | exists when `verify` is `1` |
| signature | 128 | 16 | exists when `verify` is `1` |
## Status Code Table
| value | flag | description |
| ----- | --------------------- | ----------------------------- |
| 0 | SUCCESS | Success like HTTP status 200 |
| 1 | SERVER_TIMEOUT | Timeout like HTTP status 408 |
| 3 | BAD_REQUEST | Bad Request like HTTP 400 |
| 5 | UNAUTHENTICATED | Unauthorized like HTTP 401 |
| 7 | SERVER_INTERNAL_ERROR | Internal server like HTTP 500 |