# Expression Template

# Fallthrough

## Generate fallthrough WAF expression template from a set of API hosts

`api_gateway.expression_template.fallthrough.create(FallthroughCreateParams**kwargs)  -> FallthroughCreateResponse`

**post** `/zones/{zone_id}/api_gateway/expression-template/fallthrough`

Creates an expression template fallthrough rule for API Shield. Used for configuring default behavior when no other expression templates match.

### Parameters

- `zone_id: str`

  Identifier.

- `hosts: SequenceNotStr[str]`

  List of hosts to be targeted in the expression

### Returns

- `class FallthroughCreateResponse: …`

  - `expression: str`

    WAF Expression for fallthrough

  - `title: str`

    Title for the expression

### Example

```python
import os
from cloudflare import Cloudflare

client = Cloudflare(
    api_token=os.environ.get("CLOUDFLARE_API_TOKEN"),  # This is the default and can be omitted
)
fallthrough = client.api_gateway.expression_template.fallthrough.create(
    zone_id="023e105f4ecef8ad9ca31a8372d0c353",
    hosts=["{zone}.domain1.tld", "domain2.tld"],
)
print(fallthrough.expression)
```

#### 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": {
    "expression": "(cf.api_gateway.fallthrough_detected)",
    "title": "Fallthrough Expression for [zone.domain.tld]"
  },
  "success": true
}
```

## Domain Types

### Fallthrough Create Response

- `class FallthroughCreateResponse: …`

  - `expression: str`

    WAF Expression for fallthrough

  - `title: str`

    Title for the expression