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  • v2.4.3 Changes

    October 23, 2015

    @igrep reported an anti-patter in use regarding UserAgentParser. This caused UserAgentParser to reload it's entire configuration set twice* per request. Moving this to a cached constant prevents the constant reinstantiation and will improve performance.

  • v2.4.2 Changes

    October 20, 2015

    ๐Ÿ‘€ A nasty regression meant that many CSP configuration values were "reset" after the first request, one of these being the "enforce" flag. See for the full list of fields that were affected. Thanks to @spdawson for reporting this

  • v2.4.1 Changes

    October 14, 2015

    ๐Ÿš€ This release may change the output of headers based on per browser support. Unsupported directives will be omitted based on the user agent per request. See

    ๐Ÿ›  p.s. this will likely be the last non-bugfix release for the 2.x line. 3.x will be a major change. Sneak preview:

  • v2.4.0 Changes

    October 01, 2015

    โšก๏ธ If you leveraged secure_headers automatic filling of empty directives, the header value will change but it should not affect how the browser applies the policy. The content of CSP reports may change if you do not update your policy.


      config.csp = {
        :default_src => "'self'"

    0๏ธโƒฃ would produce default-src 'self'; connect-src 'self'; frame-src 'self' ... etc.


      config.csp = {
        :default_src => "'self'"

    0๏ธโƒฃ will produce default-src 'self'

    0๏ธโƒฃ The reason for this is that a default-src violation was basically impossible to handle. Chrome sends an effective-directive which helps indicate what kind of violation occurred even if it fell back to default-src. This is part of the CSP Level 2 spec so hopefully other browsers will implement this soon.

    โ†ช Workaround

    0๏ธโƒฃ Just set the values yourself, but really a default-src of anything other than 'none' implies the policy can be tightened dramatically. "ZOMG don't you work for github and doesn't github send a default-src of *???" Yes, this is true. I disagree with this but at the same time, github defines every single known directive that a browser supports so default-src will only apply if a new directive is introduced, and we'd rather fail open. For now.

      config.csp = {
        :default_src => "'self'",
        :connect_src => "'self'",
        :frame_src => "'self'"
        ... etc.

    ๐Ÿ‘€ Besides, relying on default-src is often not what you want and encourages an overly permissive policy. I've seen it. Seriously. default-src 'unsafe-inline' 'unsafe-eval' https: http:; That's terrible.

  • v2.3.0 Changes

    September 30, 2015

    ๐Ÿ‘€ See and

    ๐Ÿ”€ tl;dr is that there is a class method SecureHeaders::header_hash that will return a hash of header name => value pairs useful for merging with the rack header hash in middleware.

  • v2.2.2 Changes

    July 02, 2015

    ๐Ÿ‘€ See

    ๐Ÿ‘ Allows you to override a controller method that returns a config in the context of the executing action.

  • v2.2.1 Changes

    June 24, 2015

    ๐Ÿ‘€ See

    โš  Safari will generate a warning that it doesn't support nonces. Safari will fall back to the unsafe-inline. Things will still work, but an ugly message is printed to the console.

    This opts out safari and IE users from the inline script protection. I haven't verified any IE behavior yet, so I'm just assuming it doesn't work.

  • v2.2.0 Changes

    June 18, 2015

    ๐Ÿ‘ Facilitates better per-request config:

    :enforce => lambda { |controller| controller.current_user.beta_testing? }

    NOTE if you used lambda config values, this will raise an exception until you add the controller reference:


    lambda { true }


    lambda { |controller| true } proc { true } proc { |controller| true }