Function fetchCSRFToken

fetchCSRFToken(
page: ODataCSRFPage,
serviceUrl: string,
): Promise<CSRFTokenResult>
Ai
Fetches a CSRF token from an OData service using a HEAD request.
Parameters
- page: ODataCSRFPage
  Playwright Page with request API (or compatible subset).
- serviceUrl: string
  The OData service root URL.
Returns Promise<CSRFTokenResult>
The CSRF token and service URL.
Capability
ui5.odata.fetchCSRFToken

Intent
Fetch a CSRF token for subsequent write operations (POST/PATCH/DELETE).

Guarantee
On success, returns a valid CSRF token string.

Prerequisite
The user session must be authenticated against the OData service.

Ai Context
Sends HEAD request with 'X-CSRF-Token: Fetch' header. Required before any write operation in SAP OData services. Token is typically valid for the session duration.

Sap Module
sap.ui.model.odata.v2.ODataModel — CSRF token handling

Business Context
Obtain CSRF token for secure write operations against SAP OData services.

Throws
ODataError if the token cannot be fetched.
Example
```
const { token } = await fetchCSRFToken(page, '/sap/opu/odata/sap/API_PRODUCT_SRV/');
```
- Defined in modules/odata.ts:378