This function exists solely to generate the correct OpenAPI documentation
for requests to /anything/{path:.*} (e.g., /anything/foo/bar).
The actual requests to these wildcard paths are handled by anything_handler.

This separation is necessary due to current limitations in utoipa regarding
the generation of OpenAPI specs for handlers that serve both a fixed path and a wildcard path.

Path Parameters:

• path: The subpath captured by the wildcard (e.g., “foo/bar”).

Responses:

• 200 OK: Echoes request details for the subpath.
• Note: This handler, if ever called directly, returns 501 Not Implemented.

Echoes back the request’s method and headers. If a JSON body is provided,
it will also be echoed. Otherwise, the body in the response will be null.

HTTP Method:

• DELETE

Request Body:

• Payload (optional): A generic JSON object.

Responses:

• 200 OK: Returns a JSON object containing method, headers, and body (if provided).

Returns a JSON array of EndpointInfo objects, each describing an endpoint’s
path, HTTP method, and a brief description.

HTTP Method:

• GET

Responses:

• 200 OK: Successfully returns the list of endpoints.
• 500 Internal Server Error: If there’s an issue serializing the endpoint data.

Echoes back the request’s method and headers as a JSON object.

HTTP Method:

• GET

Responses:

• 200 OK: Returns a JSON object containing the method and headers.

Responds with the same headers as a GET request to /get, but with no body.
This is typically used to check if a resource exists or to get its metadata
without transferring the entire content.

HTTP Method:

• HEAD

Responses:

• 200 OK: Returns an empty body with appropriate headers.