This is because their demo uses https, as recommended in their documentation ("We suggest that you make API requests over HTTPS..."). But, if you switch to usi

This is because their demo uses https, as recommended in their documentation ("We suggest that you make API requests over HTTPS..."). But, if you switch to using the http protocol, the request will return a response correctly. It's a bug. Also interesting because their website redirects http requests to the https protocol (eg. http://geteasypost.com/docs http://geteasypost.com/docs).