vibe.d https_server example fails

["Nordlöw" via Digitalmars-d-learn]

When build and run (using dub) the

examples/https_server/

under vibe.d master

it prints

Target vibe-d ~master is up to date. Use --force to rebuild.
Building https-server-example ~master configuration 
"application", build type debug.
Compiling using dmd...
Linking...
Running ./https-server-example
Listening for HTTPS requests on ::1:8080
Listening for HTTPS requests on 127.0.0.1:8080

but when I open the URL 127.0.0.1:8080 in Chrome I get an error 
message

No data is received (translated from swedish)

and my server the prints

Handling of connection failed: Failed to accept SSL tunnel:

What's wrong? Certificates?