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由于某些原因，当我使用Puma服务器从Heroku提供它们时，我的Rails资产将无法获得缓存控制标头。Rails资产在Heroku上没有Puma缓存控制标头
我在production.rbconfig.public_file_server.headers = { 'Cache-Control' => 'public, max-age=172800' }集，当我在我的本地机器上运行的应用程序，这工作得很好：
Cache-Control: public, max-age=31536000
Etag: "fdffdae515ab907046e7deed6a567968ab3e689f8505a281988bf6892003ff92"
X-Request-Id: 065e704c-1bea-428c-9c40-3cd6b6e4330a
X-Runtime: 0.002411
然而，当我部署到Heroku上，我得到以下标题：
Server: Cowboy
Date: Sat, 10 Jun 2017 18:56:26 GMT
Content-Length: 0
Connection: keep-alive
strict-transport-security: max-age=15552000; includeSubDomains
Via: 1.1 vegur
这似乎有点奇怪，令人惊讶的足够。我真的很想知道为什么会发生这种情况。我使用的是彪马web服务器，建议通过Heroku的自己 - 这是我Procfile：
web: bundle exec puma -C config/puma.rb
这是我的puma.rb在配置：
# Puma can serve each request in a thread from an internal thread pool.
# The `threads` method setting takes two numbers a minimum and maximum.
# Any libraries that use thread pools should be configured to match
# the maximum value specified for Puma. Default is set to 5 threads for minimum
# and maximum, this matches the default thread size of Active Record.
#
threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }.to_i
threads threads_count, threads_count
# Specifies the `port` that Puma will listen on to receive requests, default is 3000.
#
port ENV.fetch("PORT") { 3000 }
# Specifies the `environment` that Puma will run in.
#
environment ENV.fetch("RAILS_ENV") { "development" }
# Specifies the number of `workers` to boot in clustered mode.
# Workers are forked webserver processes. If using threads and workers together
# the concurrency of the application would be max `threads` * `workers`.
# Workers do not work on JRuby or Windows (both of which do not support
# processes).
workers ENV.fetch("WEB_CONCURRENCY") {2}
# Use the `preload_app!` method when specifying a `workers` number.
# This directive tells Puma to first boot the application and load code
# before forking the application. This takes advantage of Copy On Write
# process behavior so workers use less memory. If you use this option
# you need to make sure to reconnect any threads in the `on_worker_boot`
# block.
preload_app!
# The code in the `on_worker_boot` will be called if you are using
# clustered mode by specifying a number of `workers`. After each worker
# process is booted this block will be run, if you are using `preload_app!`
# option you will want to use this block to reconnect to any threads
# or connections that may have been created at application boot, Ruby
# cannot share connections between processes.
on_worker_boot do
ActiveRecord::Base.establish_connection if defined?(ActiveRecord)
end
# Allow puma to be restarted by `rails restart` command.
plugin :tmp_restart
任何人有什么想法？顺便说一句，与this post相反，它不会影响服务文件的哪种文件类型 - 它们都不具有缓存控制集。