## Attach Domain

`client.Workers.Domains.Update(ctx, params) (*DomainUpdateResponse, error)`

**put** `/accounts/{account_id}/workers/domains`

Attaches a domain that routes traffic to a Worker.

### Parameters

- `params DomainUpdateParams`

  - `AccountID param.Field[string]`

    Path param: Identifier.

  - `Hostname param.Field[string]`

    Body param: Hostname of the domain. Can be either the zone apex or a subdomain of the zone. Requests to this hostname will be routed to the configured Worker.

  - `Service param.Field[string]`

    Body param: Name of the Worker associated with the domain. Requests to the configured hostname will be routed to this Worker.

  - `Environment param.Field[string]`

    Body param: Worker environment associated with the domain.

  - `ZoneID param.Field[string]`

    Body param: ID of the zone containing the domain hostname.

  - `ZoneName param.Field[string]`

    Body param: Name of the zone containing the domain hostname.

### Returns

- `type DomainUpdateResponse struct{…}`

  - `ID string`

    Immutable ID of the domain.

  - `CERTID string`

    ID of the TLS certificate issued for the domain.

  - `Environment string`

    Worker environment associated with the domain.

  - `Hostname string`

    Hostname of the domain. Can be either the zone apex or a subdomain of the zone. Requests to this hostname will be routed to the configured Worker.

  - `Service string`

    Name of the Worker associated with the domain. Requests to the configured hostname will be routed to this Worker.

  - `ZoneID string`

    ID of the zone containing the domain hostname.

  - `ZoneName string`

    Name of the zone containing the domain hostname.

### Example

```go
package main

import (
  "context"
  "fmt"

  "github.com/cloudflare/cloudflare-go"
  "github.com/cloudflare/cloudflare-go/option"
  "github.com/cloudflare/cloudflare-go/workers"
)

func main() {
  client := cloudflare.NewClient(
    option.WithAPIToken("Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY"),
  )
  domain, err := client.Workers.Domains.Update(context.TODO(), workers.DomainUpdateParams{
    AccountID: cloudflare.F("023e105f4ecef8ad9ca31a8372d0c353"),
    Hostname: cloudflare.F("app.example.com"),
    Service: cloudflare.F("my-worker"),
  })
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", domain.ID)
}
```

#### Response

```json
{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "result": {
    "id": "dbe10b4bc17c295377eabd600e1787fd",
    "cert_id": "9fdf92c8-64c2-4a3d-b1af-e15304961145",
    "environment": "production",
    "hostname": "app.example.com",
    "service": "my-worker",
    "zone_id": "593c9c94de529bbbfaac7c53ced0447d",
    "zone_name": "example.com"
  },
  "success": true
}
```