## Create a custom waiting room page preview

`client.WaitingRooms.Page.Preview(ctx, params) (*PagePreviewResponse, error)`

**post** `/zones/{zone_id}/waiting_rooms/preview`

Creates a waiting room page preview. Upload a custom waiting room page for preview. You will receive a preview URL in the form `http://waitingrooms.dev/preview/<uuid>`. You can use the following query parameters to change the state of the preview:

1. `force_queue`: Boolean indicating if all users will be queued in the waiting room and no one will be let into the origin website (also known as queueAll).
1. `queue_is_full`: Boolean indicating if the waiting room's queue is currently full and not accepting new users at the moment.
1. `queueing_method`: The queueing method currently used by the waiting room.
   - **fifo** indicates a FIFO queue.
   - **random** indicates a Random queue.
   - **passthrough** indicates a Passthrough queue. Keep in mind that the waiting room page will only be displayed if `force_queue=true` or `event=prequeueing` — for other cases the request will pass through to the origin. For our preview, this will be a fake origin website returning "Welcome".
   - **reject** indicates a Reject queue.
1. `event`: Used to preview a waiting room event.
   - **none** indicates no event is occurring.
   - **prequeueing** indicates that an event is prequeueing (between `prequeue_start_time` and `event_start_time`).
   - **started** indicates that an event has started (between `event_start_time` and `event_end_time`).
1. `shuffle_at_event_start`: Boolean indicating if the event will shuffle users in the prequeue when it starts. This can only be set to **true** if an event is active (`event` is not **none**).

For example, you can make a request to `http://waitingrooms.dev/preview/<uuid>?force_queue=false&queue_is_full=false&queueing_method=random&event=started&shuffle_at_event_start=true`
6. `waitTime`: Non-zero, positive integer indicating the estimated wait time in minutes. The default value is 10 minutes.

For example, you can make a request to `http://waitingrooms.dev/preview/<uuid>?waitTime=50` to configure the estimated wait time as 50 minutes.

### Parameters

- `params PagePreviewParams`

  - `ZoneID param.Field[string]`

    Path param: Identifier.

  - `CustomHTML param.Field[string]`

    Body param: Only available for the Waiting Room Advanced subscription. This is a template html file that will be rendered at the edge. If no custom_page_html is provided, the default waiting room will be used. The template is based on mustache ( https://mustache.github.io/ ). There are several variables that are evaluated by the Cloudflare edge:

    1. {{`waitTimeKnown`}} Acts like a boolean value that indicates the behavior to take when wait time is not available, for instance when queue_all is **true**.
    1. {{`waitTimeFormatted`}} Estimated wait time for the user. For example, five minutes. Alternatively, you can use:
    1. {{`waitTime`}} Number of minutes of estimated wait for a user.
    1. {{`waitTimeHours`}} Number of hours of estimated wait for a user (`Math.floor(waitTime/60)`).
    1. {{`waitTimeHourMinutes`}} Number of minutes above the `waitTimeHours` value (`waitTime%60`).
    1. {{`queueIsFull`}} Changes to **true** when no more people can be added to the queue.

    To view the full list of variables, look at the `cfWaitingRoom` object described under the `json_response_enabled` property in other Waiting Room API calls.

### Returns

- `type PagePreviewResponse struct{…}`

  - `PreviewURL string`

    URL where the custom waiting room page can temporarily be previewed.

### Example

```go
package main

import (
  "context"
  "fmt"

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

func main() {
  client := cloudflare.NewClient(
    option.WithAPIToken("Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY"),
  )
  response, err := client.WaitingRooms.Page.Preview(context.TODO(), waiting_rooms.PagePreviewParams{
    ZoneID: cloudflare.F("023e105f4ecef8ad9ca31a8372d0c353"),
    CustomHTML: cloudflare.F("{{#waitTimeKnown}} {{waitTime}} mins {{/waitTimeKnown}} {{^waitTimeKnown}} Queue all enabled {{/waitTimeKnown}}"),
  })
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", response.PreviewURL)
}
```

#### Response

```json
{
  "result": {
    "preview_url": "http://waitingrooms.dev/preview/35af8c12-6d68-4608-babb-b53435a5ddfb"
  }
}
```