cookies.md

Cookies

SecureHeaders supports Secure, HttpOnly and SameSite cookies. These can be defined in the form of a boolean, or as a Hash for more refined configuration.

Note: Regardless of the configuration specified, Secure cookies are only enabled for HTTPS requests.

Defaults

By default, all cookies will get both Secure, HttpOnly, and SameSite=Lax.

config.cookies = {
  secure: true, # defaults to true but will be a no op on non-HTTPS requests
  httponly: true, # defaults to true
  samesite: {  # defaults to set `SameSite=Lax`
    lax: true
  }
}

Boolean-based configuration

Boolean-based configuration is intended to globally enable or disable a specific cookie attribute. Note: As of 4.0, you must use OPT_OUT rather than false to opt out of the defaults.

config.cookies = {
  secure: true, # mark all cookies as Secure
  httponly: OPT_OUT, # do not mark any cookies as HttpOnly
}

Hash-based configuration

Hash-based configuration allows for fine-grained control.

config.cookies = {
  secure: { except: ['_guest'] }, # mark all but the `_guest` cookie as Secure
  httponly: { only: ['_rails_session'] }, # only mark the `_rails_session` cookie as HttpOnly
}

SameSite cookie configuration

SameSite cookies permit either Strict or Lax enforcement mode options.

config.cookies = {
  samesite: {
    strict: true # mark all cookies as SameSite=Strict
  }
}

Strict, Lax, and None enforcement modes can also be specified using a Hash.

config.cookies = {
  samesite: {
    strict: { only: ['session_id_duplicate'] },
    lax: { only: ['_guest', '_rails_session', 'device_id'] },
    none: { only: ['_tracking', 'saml_cookie', 'session_id'] },
  }
}