Is it possible to extract data from an HTTP DELETE request, and in which cases is this permissible?

In the HTTP standard, the DELETE method usually does not include a request body, and many servers and clients ignore or do not support it. However, technically, HTTP does not prohibit a body in a DELETE request, and some APIs use it to transmit additional data.

Data can be extracted from a DELETE request if the client sends it in the body, and the server is configured to handle it. In Flutter, for example, when using the http package, you can specify a body in a DELETE request:

final response = await http.delete(
  Uri.parse('https://example.com/resource'),
  body: jsonEncode({'param': 'value'}),
  headers: {'Content-Type': 'application/json'},
);

When is this permissible:

• If the API explicitly supports and documents it.
• If you need to transmit parameters that are difficult or inconvenient to pass via URL.

However:

• It is better to use other methods (POST, PUT, PATCH) for transmitting data.
• Ensure that the server and intermediate proxies or caches handle the DELETE body correctly.

Thus, extracting data from a DELETE request is possible but requires client-server agreement and is not a common practice.