How to do it...

Now that you have webmock included in your project, you can start stubbing HTTP requests in your specs. Once again, open specs/spec_helper.rb and add the following content:

stub_request(:post, "attachment-service.yourorg.example.com").
  with(body: {media_type: 1}, headers: {"Content-Type" => /image\/.+/}).
  to_return(body: { foo: bar })