localhost:8080/stats/flowentry/add

add_flow.json

{
    "dpid": 1,
    "table_id": 0,
    "priority": 10000,
    "match":{
        "in_port": 3
    },
    "actions":[
        {
            "type": "SET_NW_SRC",
            "nw_src": "192.168.1.123"
        },
        {
            "type":"OUTPUT",
            "port": 3
        }
    ]
}