1c7de11bef
* Add Settings::UserExperience * Add DUS * Update usage * Add controller * Add e2e test * Fix specs
51 lines
2 KiB
Ruby
51 lines
2 KiB
Ruby
# Included in ApplicationController for edge caching
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module CachingHeaders
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extend ActiveSupport::Concern
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# The following is from the now deprecated fastly-rails gem
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# https://github.com/fastly/fastly-rails/tree/master/lib/fastly-rails/action_controller
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# Sets Cache-Control and Surrogate-Control HTTP headers
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# Surrogate-Control is stripped at the cache, Cache-Control persists (in case of other caches in front of fastly)
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# Defaults are:
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# Cache-Control: 'public, no-cache'
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# Surrogate-Control: 'max-age: 86400' - 1 day in seconds
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# custom config example:
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# {cache_control: 'public, no-cache, maxage=xyz', surrogate_control: 'max-age: 100'}
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def set_cache_control_headers(
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max_age = 1.day.to_i,
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surrogate_control: nil,
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stale_while_revalidate: nil,
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stale_if_error: 26_400
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)
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# Only public forems should be edge-cached based on current functionality.
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return unless Settings::UserExperience.public
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request.session_options[:skip] = true # no cookies
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RequestStore.store[:edge_caching_in_place] = true # To be observed downstream.
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response.headers["Cache-Control"] = "public, no-cache" # Used only by Fastly.
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response.headers["X-Accel-Expires"] = max_age.to_s # Used only by Nginx.
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response.headers["Surrogate-Control"] = surrogate_control.presence || build_surrogate_control(
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max_age, stale_while_revalidate: stale_while_revalidate, stale_if_error: stale_if_error
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)
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end
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# Sets Surrogate-Key HTTP header with one or more keys strips session data
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# from the request.
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def set_surrogate_key_header(*surrogate_keys)
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request.session_options[:skip] = true # No Set-Cookie
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response.headers["Surrogate-Key"] = surrogate_keys.join(" ")
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end
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private
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def build_surrogate_control(max_age, stale_while_revalidate: nil, stale_if_error: 26_400)
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surrogate_control = "max-age=#{max_age}"
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surrogate_control += ", stale-while-revalidate=#{stale_while_revalidate}" if stale_while_revalidate
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surrogate_control += ", stale-if-error=#{stale_if_error}" if stale_if_error
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surrogate_control
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end
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end
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