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How do you create a custom REST resource in Drupal?

How do you create a custom REST resource in Drupal?

Answer: To create a custom REST resource in Drupal, follow these steps:

1. Create a Custom Module: Set up a new module with the required `.info.yml` file.

2. Implement Hook: Use `hook_rest_resource_info()` to define your resource, specifying its properties like methods (GET, POST), and path.

3. Define the Resource Class: Create a class that extends `ResourceBase` or `EntityResource`, implementing necessary methods (`get`, `post`, etc.) to handle requests.

4. Routing: Add a routing file (`MODULE_NAME.routing.yml`) to define the URL path for your resource.

5. Permissions: Optionally, manage permissions for accessing your resource in the module.

6. Clear Cache: Clear the cache to register the new resource.

This creates a custom REST endpoint that processes HTTP requests according to your specifications.

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