Rails 流式传输不是流式传输

Question

我正在努力向我的 rails 应用程序添加一个流组件，因为我想开始使用 SSE。我曾尝试在一个较小的示例中使用它，但仍然遇到问题。实际上，我一直无法让 Rails 正确地流式传输对 curl 请求的响应。我正在关注http://tenderlovemaking.com/2012/07/30/is-it-live.html 上的教程。我不确定是否需要为 OSX 配置某些东西，或者我的配置中是否缺少某些东西。任何帮助将不胜感激。

我在 OSX 上本地运行它。当我运行时，curl -i localhost:3000我得到以下响应：

HTTP/1.1 200 OK
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-UA-Compatible: chrome=1
Content-Type: text/event-stream
Last-Modified: Wed Apr 23 23:10:15 2014
Cache-Control: no-cache
Set-Cookie: request_method=GET; path=/
X-Request-Id: 89f2af3e-76e9-4873-85b0-3b6fe45f6343
X-Runtime: 0.001724
Transfer-Encoding: chunked

hello world
hello world
hello world
hello world
hello world
hello world
hello world
hello world
hello world
hello world

问题是我一次得到了它，而不是像预期的那样得到一些响应。如果我需要提供更多信息，请告诉我

我的代码如下：

stream_test_controller.rb

class StreamTestController < ActionController::Base
  include ActionController::Live

  def index
    response.headers['Content-Type'] = 'text/event-stream'
    10.times {
      logger.info "hello world sent"
      response.stream.write "hello world\n"
      sleep 1
    }
    response.stream.close
  end
end

文件

source 'https://rubygems.org'  
ruby '2.1.0'

gem 'rails', '4.0.3'
gem 'sqlite3'
gem 'sass-rails', '~> 4.0.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 1.2'
gem 'puma'

group :doc do
  gem 'sdoc', require: false
end

发展.rb

StreamTest::Application.configure do

  config.preload_frameworks = true
  config.allow_concurrency = true
  # Settings specified here will take precedence over those in config/application.rb.

  # In the development environment your application's code is reloaded on
  # every request. This slows down response time but is perfect for development    
  # since you don't have to restart the web server when you make code changes.
  config.cache_classes = true

  # Do not eager load code on boot.
  config.eager_load = true

  # Show full error reports and disable caching.
  config.consider_all_requests_local       = true
  config.action_controller.perform_caching = false

  # Don't care if the mailer can't send.
  config.action_mailer.raise_delivery_errors = false

  # Print deprecation notices to the Rails logger.
  config.active_support.deprecation = :log

  # Raise an error on page load if there are pending migrations
  config.active_record.migration_error = :page_load

  # Debug mode disables concatenation and preprocessing of assets.
  # This option may cause significant delays in view rendering with a large
  # number of complex assets.
  config.assets.debug = true
end

Answer 1

从这里的文档来看，您是否使用 WEBrick 进行测试？

WEBrick 服务器缓冲所有响应，因此包括 ActionController::Live 将不起作用。您必须使用不会自动缓冲响应的 Web 服务器。