Rails has built-in HTTPS enforcement via a single configuration line, applied at the application level rather than requiring separate web server rules.
# config/environments/production.rb
config.force_ssl = trueThis does more than just redirect — it also sets the Secure flag on cookies (preventing them from ever being sent over plain HTTP) and adds an HSTS header by default, giving you the redirect and two other HTTPS-related protections in one setting.
Behind a load balancer or proxy
As with other frameworks, if TLS terminates at a load balancer in front of your Rails app, ensure the proxy correctly sets and forwards the X-Forwarded-Proto header — Rails' force_ssl relies on this to know the original connection was in practice secure, and without it you'll get a redirect loop identical to the Django and Express cases.
What force_ssl changes about cookie behavior exactly
Enabling config.force_ssl automatically sets the Secure flag on every cookie Rails issues, ensuring session and other cookies are never transmitted over an accidental plain HTTP connection — a meaningful security improvement bundled into the same single setting that handles the redirect itself.
Why Rails' HSTS default differs from a manually configured header
Rails' force_ssl setting includes a reasonable default HSTS configuration out of the box, though the specific max-age and includeSubDomains behavior can be customized further — worth reviewing against the staged rollout approach covered in our HSTS deep dive before relying on the framework's default for a production deployment with existing subdomains.
Why testing in a staging environment before production matters here in particular
Because force_ssl affects cookie behavior in addition to the redirect itself, testing in a staging environment that mirrors your production proxy setup catches any forwarded-header misconfiguration before it affects real users, rather than discovering a redirect loop only after deploying to production.
What Rails' environment-specific configuration means for enabling this safely
Rails' environment-based configuration files (production.rb, development.rb) let you enable force_ssl in production while leaving it disabled in development, avoiding the same local-testing redirect loop issue that applies to Django and other frameworks covered in this category.
How force_ssl interacts with Rails API-only applications differently
A Rails application generated in API-only mode still supports force_ssl identically to a full Rails application, since the setting operates at the framework's core request-handling level rather than depending on view-rendering or other full-application-specific features.
Why some Rails hosting platforms enable this automatically without explicit configuration
Some managed Rails hosting platforms set force_ssl or an equivalent enforcement automatically as part of their platform defaults, meaning you may find HTTPS already enforced even before explicitly setting this yourself — worth checking your specific hosting platform's documentation before assuming manual configuration is required.
Why Rails' bundled approach remains a genuine convenience worth appreciating
Having redirect enforcement, secure cookies, and HSTS all bundled into a single force_ssl setting is a meaningful convenience compared to frameworks requiring each of these to be configured separately — worth appreciating as one of Rails' in fact useful built-in security defaults.
What Rails API mode changes about the cookie-related side effects precisely
A Rails application generated in API-only mode typically doesn't rely on the same cookie-based session handling a full Rails application does, meaning force_ssl's automatic Secure cookie flag has less practical effect — the redirect enforcement itself still applies identically regardless of API-only mode.
How this setting interacts with Rails' asset pipeline and CDN-served assets
If static assets are served through a CDN rather than by your Rails application, confirm the CDN's own configuration serves assets over HTTPS independently, since force_ssl's redirect enforcement applies to your Rails application's own responses, not to a separate CDN's asset delivery.
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