HTTP Method:

• GET

Responses:

• 200 OK: Returns a plain text welcome message.

This endpoint is useful for debugging and understanding how requests are processed.
It reflects the method, path, query parameters, headers, and body of the request.

Responses:

• 200 OK: Successfully echoed the request details as a JSON object.

Note: While this handler is registered for /anything and /anything/*path,
the OpenAPI documentation for /anything/*path is handled by anything_path_handler
due to current limitations in utoipa with wildcard path parameters in a single handler.

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).