# 4 Trapper items

#### Overview

Zabbix server uses a JSON- based communication protocol for receiving
data from Zabbix sender with the help of [trapper
item](/fr/manual/config/items/itemtypes/trapper).

Request and response messages must begin with [header and data
length](/fr/manual/appendix/protocols/header_datalen).

#### Zabbix sender request

``` {.javascript}
{
    "request":"sender data",
    "data":[
        {
            "host":"<hostname>",
            "key":"trap",
            "value":"test value"
        }
    ]
}
```

#### Zabbix server response

``` {.javascript}
{
    "response":"success",
    "info":"processed: 1; failed: 0; total: 1; seconds spent: 0.060753"
}
```

#### Alternatively Zabbix sender can send request with a timestamp

``` {.javascript}
{
    "request":"sender data",
    "data":[
        {
            "host":"<hostname>",
            "key":"trap",
            "value":"test value",
            "clock":1516710794
        },
        {
            "host":"<hostname>",
            "key":"trap",
            "value":"test value",
            "clock":1516710795
        }
    ],
    "clock":1516712029,
    "ns":873386094
}
```

#### Zabbix server response

``` {.javascript}
{
    "response":"success",
    "info":"processed: 2; failed: 0; total: 2; seconds spent: 0.060904"
}
```