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为什么这个机架文件适用于 Thin，而不适用于 WEBrick 或 Unicorn?

本文介绍了为什么这个机架文件适用于 Thin，而不适用于 WEBrick 或 Unicorn?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我在本地运行静态网站时遇到一个奇怪的问题(用于测试).当导航到 root 时，WEBrick 和 Unicorn 都会导致 Rack 中的断言失败.然而 Thin 有效完美.

I am having a strange issue running my static website locally (for testing).Both WEBrick and Unicorn are causing an assertion failure in Rack when navigating to root. However Thin worksperfectly.

我的机架文件config.ru":

My rackup file 'config.ru':

# This is the root of our app
@root = File.expand_path(File.dirname(__FILE__)) + '/site'
default_charset = "; charset=UTF-8"

run Proc.new { |env|

    # Extract the requested path from the request
    path = Rack::Utils.unescape(env['PATH_INFO'])
    index_file = @root + "#{path}/index.html"

    if File.exists?(index_file)
        # Return the index
        [200, {'Content-Type' => 'text/html' + default_charset}, File.read(index_file)]
    else
        # Pass the request to the directory app
        response = Rack::Directory.new(@root).call(env)
        if response[1]['Content-Type']
            response[1]['Content-Type'] += default_charset
        end
        response
    end
}

宝石列表如下:

$ bundle exec gem list

*** LOCAL GEMS ***

bundler (1.0.18)
coderay (0.9.8)
daemons (1.1.4)
erector (0.8.3)
eventmachine (0.12.10)
kgio (2.6.0)
kramdown (0.13.3)
polyglot (0.3.2)
rack (1.3.2)
raindrops (0.7.0)
rake (0.9.2)
thin (1.2.11)
treetop (1.4.10)
unicorn (4.1.1)

这些是我得到的错误:

$ bundle exec rackup
[2011-09-12 21:19:50] INFO  WEBrick 1.3.1
[2011-09-12 21:19:50] INFO  ruby 1.9.2 (2010-08-18) [x86_64-linux]
[2011-09-12 21:19:50] INFO  WEBrick::HTTPServer#start: pid=2556 port=9292
127.0.0.1 - - [12/Sep/2011 21:20:05] "GET / HTTP/1.1" 200 - 0.0027
[2011-09-12 21:20:05] ERROR Rack::Lint::LintError: Response body must respond to each
        /home/scott/development/test/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/lint.rb:19:in `assert'
        /home/scott/development/test/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/lint.rb:513:in `each'
        /home/scott/development/test/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/body_proxy.rb:26:in `method_missing'
        /home/scott/development/test/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/chunked.rb:23:in `each'
        /home/scott/development/test/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/handler/webrick.rb:71:in `service'
        /usr/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
        /usr/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
        /usr/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

$ bundle exec unicorn
I, [2011-09-12T21:20:33.219694 #2567]  INFO -- : listening on addr=0.0.0.0:8080 fd=3
I, [2011-09-12T21:20:33.219883 #2567]  INFO -- : worker=0 spawning...
I, [2011-09-12T21:20:33.220771 #2567]  INFO -- : master process ready
I, [2011-09-12T21:20:33.221535 #2570]  INFO -- : worker=0 spawned pid=2570
I, [2011-09-12T21:20:33.221787 #2570]  INFO -- : Refreshing Gem list
I, [2011-09-12T21:20:33.253184 #2570]  INFO -- : worker=0 ready
127.0.0.1 - - [12/Sep/2011 21:20:41] "GET / HTTP/1.1" 200 - 0.0030
E, [2011-09-12T21:20:41.087884 #2570] ERROR -- : app error: Response body must respond to each (Rack::Lint::LintError)
E, [2011-09-12T21:20:41.087935 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/lint.rb:19:in `assert'
E, [2011-09-12T21:20:41.087968 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/lint.rb:513:in `each'
E, [2011-09-12T21:20:41.087991 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/body_proxy.rb:26:in `method_missing'
E, [2011-09-12T21:20:41.088013 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/chunked.rb:23:in `each'
E, [2011-09-12T21:20:41.088035 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/gems/unicorn-4.1.1/lib/unicorn/http_response.rb:41:in `http_response_write'
E, [2011-09-12T21:20:41.088057 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/gems/unicorn-4.1.1/lib/unicorn/http_server.rb:536:in `process_client'
E, [2011-09-12T21:20:41.088078 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/gems/unicorn-4.1.1/lib/unicorn/http_server.rb:600:in `worker_loop'
E, [2011-09-12T21:20:41.088100 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/gems/unicorn-4.1.1/lib/unicorn/http_server.rb:485:in `spawn_missing_workers'
E, [2011-09-12T21:20:41.088124 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/gems/unicorn-4.1.1/lib/unicorn/http_server.rb:135:in `start'
E, [2011-09-12T21:20:41.088147 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/gems/unicorn-4.1.1/bin/unicorn:121:in `<top (required)>'
E, [2011-09-12T21:20:41.088168 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/bin/unicorn:19:in `load'
E, [2011-09-12T21:20:41.088190 #2570] ERROR -- : /home/scott/development/test/bundle/ruby/1.9.1/bin/unicorn:19:in `<main>'

而且瘦得很好:

$bundle exec thin start
>> Using rack adapter
>> Thin web server (v1.2.11 codename Bat-Shit Crazy)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:3000, CTRL+C to stop
^C>> Stopping ...

为什么会发生这种情况，当所有三个服务器都应该遵守机架规格?

Why is this happening, when all three servers are supposed to adhere to theRack specification?

推荐答案

三个都在 ruby​​ 1.9 上运行吗?

Are all three running on ruby 1.9?

如果您查看机架规范(在此处找到:http://rack.rubyforge.org/doc/SPEC.html) 在正文部分下它说:

If you check out the rack spec (found here: http://rack.rubyforge.org/doc/SPEC.html) under the body section it says:

Body 必须响应每个并且只能产生 String 值.Body 本身不应该是 String 的实例，因为这会在 Ruby 1.9 中中断.

The Body must respond to each and must only yield String values. The Body itself should not be an instance of String, as this will break in Ruby 1.9.

因此，根据规范，我猜在检查它对每个版本的响应时还是很松懈，或者可能在 ruby​​ 版本中存在差异?

So according to the spec i'd guess either thin is a little slacker in checking it responds to each or perhaps theres a difference in the ruby versions?

这篇关于为什么这个机架文件适用于 Thin，而不适用于 WEBrick 或 Unicorn?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

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