This app has been a huge help in testing APIs as theyre being developed. Theres only one thing I would change. I would love the option to turn off the username/password popup when the API returns a 401 response. It doesnt seem to be possible to test out error responses for invalid authentication credentials because of the popup. If I cancel the popup, the error response from the server is never actually loaded into the response view. Aside from that, this app is definitely worth $1.99.