The Hiawatha v10.2 source package contains a script which can be used to retrieve a Let's Encrypt certificate. A few changes have been made to the AccessList and PasswordFile option to make the obtaining of a Let's Encrypt certificate easy. Consult the manual page for the details. The script can be found in the source package in the directory 'extra'.
"The small but secure Hiawatha web server provides an appealing alternative to the complex Apache and other alternatives."
Security on the Internet is vital. The Hiawatha web server is a small (and free) web server that subscribes to the principle "security by default."
The upcoming edition of the Admin magazine will contain a story about Hiawatha. Many thanks to Hans-Cees Speel.