---
title: Update a Content Scanning custom expression for a zone.
---

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[API Reference](https://developers.cloudflare.com/api/python)

[Content Scanning](https://developers.cloudflare.com/api/python/resources/content_scanning)

[Payloads](https://developers.cloudflare.com/api/python/resources/content_scanning/subresources/payloads)

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# Update a Content Scanning custom expression for a zone.

content\_scanning.payloads.update(strexpression\_id, PayloadUpdateParams\*\*kwargs) -> SyncSinglePage\[[PayloadUpdateResponse](<https://developers.cloudflare.com/api/python/resources/content_scanning#(resource)%20content_scanning.payloads%20%3E%20(model)%20payload_update_response%20%3E%20(schema)>)]

PATCH/zones/{zone\_id}/content-upload-scan/payloads/{expression\_id}

Update the Content Scanning custom expression with the given identifier and return the updated list of expressions.

##### Security

<details>

<summary>API Token</summary>



The preferred authorization scheme for interacting with the Cloudflare API. <a href="https://developers.cloudflare.com/fundamentals/api/get-started/create-token/">Create a token</a>.

**Example:**<code>Authorization: Bearer Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY</code>

</details>

<details>

<summary>API Email + API Key</summary>



The previous authorization scheme for interacting with the Cloudflare API, used in conjunction with a Global API key.

**Example:**<code>X-Auth-Email: user@example.com</code>

The previous authorization scheme for interacting with the Cloudflare API. When possible, use API tokens instead of Global API keys.

**Example:**<code>X-Auth-Key: 144c9defac04969c7bfad8efaa8ea194</code>

</details>

##### Accepted Permissions (at least one required)

`Zone WAF Write``Account WAF Write`

##### ParametersExpand Collapse

zone\_id: str

Defines an identifier.

maxLength32

[Link to this property](<#(resource)%20content_scanning.payloads%20%3E%20(method)%20update%20%3E%20(params)%20default%20%3E%20(param)%20zone_id%20%3E%20(schema)>)

expression\_id: str

Defines the unique ID for this Content Scanning custom expression.

maxLength32

[Link to this property](<#(resource)%20content_scanning.payloads%20%3E%20(method)%20update%20%3E%20(params)%20default%20%3E%20(param)%20expression_id%20%3E%20(schema)>)

payload: str

Defines the custom content extraction expression used to reach content objects in the request.

[Link to this property](<#(resource)%20content_scanning.payloads%20%3E%20(method)%20update%20%3E%20(params)%20default%20%3E%20(param)%20payload%20%3E%20(schema)>)

##### ReturnsExpand Collapse

<details>

<summary>

class PayloadUpdateResponse: …

Defines a Content Scanning custom expression.

</summary>

id: Optional\[str]

Defines the unique ID for this Content Scanning custom expression.

maxLength32

<a href="#(resource)%20content_scanning.payloads%20%3E%20(model)%20payload_update_response%20%3E%20(schema)%20%3E%20(property)%20id">Link to this property</a>

payload: Optional\[str]

Defines the custom content extraction expression used to reach content objects in the request.

<a href="#(resource)%20content_scanning.payloads%20%3E%20(model)%20payload_update_response%20%3E%20(schema)%20%3E%20(property)%20payload">Link to this property</a>

</details>

[Link to this property](<#(resource)%20content_scanning.payloads%20%3E%20(model)%20payload_update_response%20%3E%20(schema)>)

### Update a Content Scanning custom expression for a zone.

Python

HTTPTypeScriptPythonGoTerraform

```
import os
from cloudflare import Cloudflare

client = Cloudflare(
    api_token=os.environ.get("CLOUDFLARE_API_TOKEN"),  # This is the default and can be omitted
)
page = client.content_scanning.payloads.update(
    expression_id="a350a054caa840c9becd89c3b4f0195b",
    zone_id="023e105f4ecef8ad9ca31a8372d0c353",
    payload="lookup_json_string(http.request.body.raw, \"file\")",
)
page = page.result[0]
print(page.id)
```

200 example

```
{
  "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": "a350a054caa840c9becd89c3b4f0195b",
      "payload": "lookup_json_string(http.request.body.raw, \"file\")"
    }
  ],
  "success": true
}
```

##### Returns Examples

200 example

```
{
  "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": "a350a054caa840c9becd89c3b4f0195b",
      "payload": "lookup_json_string(http.request.body.raw, \"file\")"
    }
  ],
  "success": true
}
```