MSW Interceptor

If your app doesn’t use fetch, you can try the MSW interceptor, which can capture a broader range of request types. It can be used for both server-side and client-side interception.

import { setupServer } from 'msw/node';
import { createHandler } from 'request-mocking-protocol/msw';

const mockHandler = createHandler(() => {
  // read and return headers of the incoming HTTP request
});
const mswServer = setupServer(mockHandler);
mswServer.listen();

Note that MSW is used only to capture the request, while the mocks should be declaratively defined using the MockClient class.

The function for retrieving incoming HTTP headers depends on the application framework.