POST http://localhost:12128/rest/flow/api
Content-Type: application/json

{
  "callType": "findRoleList",
  "userName": "张"
}

###
POST http://localhost:12128/rest/flow/api
Content-Type: application/json

{
"callType": "findRoleList",
"userName": ""
}

###
POST http://localhost:12128/rest/flow/api
Content-Type: application/json

{
  "callType": "findRoleList"
}