secure introspectable tunnels to localhost - server part

 ngrok creates a tunnel from the public internet to a port on your
 local machine. You can give this URL to anyone to allow them to try
 out a web site you're developing without doing any deployment.
 .
 It captures all traffic through the tunnel. It displays information
 about the HTTP traffic for your inspection. Raw request/response
 bytes, parsed headers and form data, JSON/XML syntax checking and more
 are included. It can also replay requests.
 .
 By default, ngrok will use ngrok.com as a third-party relay. This
 service is provided at no-cost and without registration but it is
 possible to get additional features by signing up in the service
 (which is pay-as-you-want kind). However, it is possible to setup and
 use its own server.
 .
 This package installs the server part of ngrok. It permits one to use
 the client without using ngrok.com