Motivation:

HTTP is a plaintext protocol which means that someone may be able
to eavesdrop the data. To prevent this, HTTPS should be used whenever
possible. However, maintaining using https:// in all URLs may be
difficult. The nohttp tool can help here. The tool scans all the files
in a repository and reports where http:// is used.

Modifications:

- Added nohttp (via checkstyle) into the build process.
- Suppressed findings for the websites
  that don't support HTTPS or that are not reachable

Result:

- Prevent using HTTP in the future.
- Encourage users to use HTTPS when they follow the links they found in
  the code.