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41 lines
1.3 KiB
Ruby
41 lines
1.3 KiB
Ruby
# frozen_string_literal: true
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module Middleware
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# Cheat and bypass Rails in development mode if the client attempts to download a static asset
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# that's already been downloaded.
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#
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# Also ensures that assets are not cached in development mode. Around Chrome 29, the behavior
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# of `must-revalidate` changed and would often not request assets that had changed.
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#
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# To use, include in your project and add the following to development.rb:
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#
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# require 'middleware/turbo_dev'
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# config.middleware.insert 0, Middleware::TurboDev
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#
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class TurboDev
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def initialize(app, settings = {})
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@app = app
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end
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def call(env)
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root = "#{GlobalSetting.relative_url_root}/assets/"
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is_asset = env['REQUEST_PATH'] && env['REQUEST_PATH'].starts_with?(root)
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# hack to bypass all middleware if serving assets, a lot faster 4.5 seconds -> 1.5 seconds
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if (etag = env['HTTP_IF_NONE_MATCH']) && is_asset
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name = env['REQUEST_PATH'][(root.length)..-1]
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etag = etag.gsub "\"", ""
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asset = Rails.application.assets.find_asset(name)
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if asset && asset.digest == etag
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return [304, {}, []]
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end
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end
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status, headers, response = @app.call(env)
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headers['Cache-Control'] = 'no-cache' if is_asset
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[status, headers, response]
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end
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end
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end
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