Update datasource attribute with API

1

Hello, i want update a specific attribute of grafana datasource.
PUT /api/datasources/id passing the correct authentication and the body with:
{
“url”: “http://…:8086”
}
I am facing this problem when i try to update grafana datasource:

[
  {
    "fieldNames": [
      "Name"
    ],
    "classification": "RequiredError",
    "message": "Required"
  },
  {
    "fieldNames": [
      "Type"
    ],
    "classification": "RequiredError",
    "message": "Required"
  },
  {
    "fieldNames": [
      "Access"
    ],
    "classification": "RequiredError",
    "message": "Required"
  }
]

What i need to do if i want to update just one attribute?