这里是一个repo演示了在Heroku上使用Rails 5.2提供自定义字体。它进一步优化服务字体，根据https://www.webpagetest.org/尽可能快

https://github.com/nzoschke/edgecors

首先，我从上面的答案中挑选了一些。对于Rails 5.2+，您不需要额外的资产管道配置。

资产管道和SCSS

将字体放置在app/assets/fonts中 将@font-face声明放在一个scss文件中，并使用font-url帮助器

从app /资产/样式表/ welcome.scss:

@font-face {
  font-family: 'Inconsolata';
  src: font-url('Inconsolata-Regular.ttf') format('truetype');
  font-weight: normal;
  font-style: normal;
}

body {
  font-family: "Inconsolata";
  font-weight: bold;
}

从CDN与CORS服务

我正在使用CloudFront，添加了Heroku Edge插件。

首先在生产端配置CDN前缀和默认的Cache-Control头。rb:

Rails.application.configure do
  # e.g. https://d1unsc88mkka3m.cloudfront.net
  config.action_controller.asset_host = ENV["EDGE_URL"]

  config.public_file_server.headers = {
    'Cache-Control' => 'public, max-age=31536000'
  }
end

如果您尝试从herokuapp.com URL访问CDN URL的字体，您将在浏览器中得到一个CORS错误:

从“https://edgecors.herokuapp.com”访问“https://d1unsc88mkka3m.cloudfront.net/assets/Inconsolata-Regular.ttf”的字体已被CORS政策阻止: 被请求的资源上没有'Access-Control-Allow-Origin'标头。edgecors.herokuapp.com/ GET https://d1unsc88mkka3m.cloudfront.net/assets/Inconsolata-Regular.ttf net::ERR_FAILED

因此，配置CORS以允许从Heroku到CDN URL访问字体:

module EdgeCors
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 5.2

    config.middleware.insert_after ActionDispatch::Static, Rack::Deflater

    config.middleware.insert_before 0, Rack::Cors do
      allow do
        origins %w[
          http://edgecors.herokuapp.com
          https://edgecors.herokuapp.com
        ]
        resource "*", headers: :any, methods: [:get, :post, :options]
      end
    end
  end
end

服务gzip字体资产

资产管道构建一个.ttf.gz文件，但不为它服务。这个monkey补丁将资产管道gzip白名单更改为黑名单:

require 'action_dispatch/middleware/static'

ActionDispatch::FileHandler.class_eval do
  private

    def gzip_file_path(path)
      return false if ['image/png', 'image/jpeg', 'image/gif'].include? content_type(path)
      gzip_path = "#{path}.gz"
      if File.exist?(File.join(@root, ::Rack::Utils.unescape_path(gzip_path)))
        gzip_path
      else
        false
      end
    end
end

最终的结果是app/assets/fonts中的自定义字体文件，这些文件由CloudFront长期缓存提供。

If your Rails version is between > 3.1.0 and < 4, place your fonts in any of the these folders: app/assets/fonts lib/assets/fonts vendor/assets/fonts For Rails versions > 4, you must place your fonts in the app/assets/fonts folder. Note: To place fonts outside of these designated folders, use the following configuration: config.assets.precompile << /\.(?:svg|eot|woff|ttf)\z/ For Rails versions > 4.2, it is recommended to add this configuration to config/initializers/assets.rb. However, you can also add it to either config/application.rb , or to config/production.rb Declare your font in your CSS file: @font-face { font-family: 'Icomoon'; src:url('icomoon.eot'); src:url('icomoon.eot?#iefix') format('embedded-opentype'), url('icomoon.svg#icomoon') format('svg'), url('icomoon.woff') format('woff'), url('icomoon.ttf') format('truetype'); font-weight: normal; font-style: normal; } Make sure your font is named exactly the same as in the URL portion of the declaration. Capital letters and punctuation marks matter. In this case, the font should have the name icomoon. If you are using Sass or Less with Rails > 3.1.0 (your CSS file has .scss or .less extension), then change the url(...) in the font declaration to font-url(...). Otherwise, your CSS file should have the extension .css.erb, and the font declaration should be url('<%= asset_path(...) %>'). If you are using Rails > 3.2.1, you can use font_path(...) instead of asset_path(...). This helper does exactly the same thing but it's more clear. Finally, use your font in your CSS like you declared it in the font-family part. If it was declared capitalized, you can use it like this: font-family: 'Icomoon';

如果你有一个叫做scaffold。css的文件。Scss，那么就有可能覆盖您在其他文件中所做的所有自定义操作。我把那个文件注释掉了，突然之间一切都正常了。如果那个文件里没有什么重要的东西，你还不如把它删掉!

如果你不想跟踪字体的移动:

# Adding Webfonts to the Asset Pipeline
config.assets.precompile << Proc.new { |path|
  if path =~ /\.(eot|svg|ttf|woff)\z/
    true
  end
}

下面是我在资产管道中使用字体的方法:

1)把你所有的字体文件放在app/assets/fonts/下，实际上你不限制把它放在fonts文件夹名称下。你可以放任何你喜欢的子文件夹名。例如app/assets/abc或app/assets/anotherfonts。但我强烈建议你把它放在app/assets/fonts/文件夹结构更好。

2)从你的sass文件中，使用sass helper font-path来请求你的字体资产，就像这样

@font-face {
    font-family: 'FontAwesome';
    src: url(font-path('fontawesome-webfont.eot') + '?v=4.4.0');
    src: url(font-path('fontawesome-webfont.eot') + '?#iefix&v=4.4.0') format('embedded-opentype'),
         url(font-path('fontawesome-webfont.woff2') + '?v=4.4.0') format('woff2'),
         url(font-path('fontawesome-webfont.woff') + '?v=4.4.0') format('woff'),
         url(font-path('fontawesome-webfont.ttf') + '?v=4.4.0') format('truetype'),
         url(font-path('fontawesome-webfont.svg') + '?v=4.4.0#fontawesomeregular') format('svg');
    font-weight: normal;
    font-style: normal;
}

3)运行bundle exec rake assets:从本地机器预编译并查看application.css的结果。你应该会看到这样的东西:

@font-face {
    font-family: 'FontAwesome';
    src: url("/assets/fontawesome-webfont-d4f5a99224154f2a808e42a441ddc9248ffe78b7a4083684ce159270b30b912a.eot" "?v=4.4.0");
    src: url("/assets/fontawesome-webfont-d4f5a99224154f2a808e42a441ddc9248ffe78b7a4083684ce159270b30b912a.eot" "?#iefix&v=4.4.0") format("embedded-opentype"), url("/assets/fontawesome-webfont-3c4a1bb7ce3234407184f0d80cc4dec075e4ad616b44dcc5778e1cfb1bc24019.woff2" "?v=4.4.0") format("woff2"), url("/assets/fontawesome-webfont-a7c7e4930090e038a280fd61d88f0dc03dad4aeaedbd8c9be3dd9aa4c3b6f8d1.woff" "?v=4.4.0") format("woff"), url("/assets/fontawesome-webfont-1b7f3de49d68b01f415574ebb82e6110a1d09cda2071ad8451bdb5124131a292.ttf" "?v=4.4.0") format("truetype"), url("/assets/fontawesome-webfont-7414288c272f6cc10304aa18e89bf24fb30f40afd644623f425c2c3d71fbe06a.svg" "?v=4.4.0#fontawesomeregular") format("svg");
    font-weight: normal;
    font-style: normal;
}

如果你想了解更多资产管道是如何工作的，你可以访问下面的简单指南: https://designcode.commandrun.com/rails-asset-pipeline-simple-guide-830e2e666f6c#.6lejlayk2

在我的情况下，最初的问题是使用资产url没有结果，而不是简单的url css属性。使用asset-url最终为我在Heroku工作。另外，在/assets/fonts文件夹中设置字体并调用asset-url('font.eot')，而无需添加任何子文件夹或任何其他配置。