HTTP Strict Transport Security
Strict Transport Security (STS) is an opt-in security enhancement that forces usage of HTTPS instead of HTTP.
Enabling STS
Implementing STS is actually very simple and only takes a few lines of code.  But better yet, a few different open-source modules exist that bring support for this feature to Express and Sails.  To use one of these modules, install it from npm using the directions below, then open config/http.js in your project and configure it as a custom middleware.  The example(s) below cover basic usage and configuration.  For more guidance and advanced usage details, be sure and follow the link to the docs.
Using lusca
luscais open-source under the Apache license
# In your sails app
npm install lusca --save
Then in the middleware config object in config/http.js:
  // ...
  // maxAge ==> Number of seconds strict transport security will stay in effect.
  strictTransportSecurity: require('lusca').hsts({ maxAge: 31536000 })
  // ...