gistfile1.txt

uri = URI.parse("http://localhost:4000")
uri_with_scheme = %URI{scheme: "http", host: "localhost", port: 8080}
uri_without_scheme = %URI{host: "localhost", port: 8080}

URI.merge(uri, uri_with_scheme)                                                                                     %URI{
  authority: nil,
  fragment: nil,
  host: "localhost",
  path: nil,
  port: 8080,
  query: nil,
  scheme: "http",
  userinfo: nil
}

URI.merge(uri, uri_without_scheme)
%URI{
  authority: "localhost:4000",
  fragment: nil,
  host: "localhost",
  path: nil,
  port: 4000,
  query: nil,
  scheme: "http",
  userinfo: nil
}