OpenURI - XML 源上的 500 内部服务器错误

Question

我正在尝试阅读斯坦福 ecorner XML:

open("http://ecorner.stanford.edu/RecentlyAdded.xml")

但遇到以下错误消息：

OpenURI::HTTPError: 500 Internal Server Error
    from /usr/local/lib/ruby/1.8/open-uri.rb:277:in `open_http'
    from /usr/local/lib/ruby/1.8/open-uri.rb:616:in `buffer_open'
    from /usr/local/lib/ruby/1.8/open-uri.rb:164:in `open_loop'
    from /usr/local/lib/ruby/1.8/open-uri.rb:162:in `catch'
    from /usr/local/lib/ruby/1.8/open-uri.rb:162:in `open_loop'
    from /usr/local/lib/ruby/1.8/open-uri.rb:132:in `open_uri'
    from /usr/local/lib/ruby/1.8/open-uri.rb:518:in `open'
    from /usr/local/lib/ruby/1.8/open-uri.rb:30:in `open'
    from (irb):65
    from :0

我相信，但我可能是错的，这是因为我需要登录才能使用提要。

我可以使用任何解决方法吗？

Answer 1

如果未登录，您应该收到 HTTP 响应代码 401 Unauthorized 而不是 500。我尝试在浏览器中打开该网站，结果有效。事实证明，他们的网络服务器不喜欢缺少用户代理，因此如果您添加 open-uri 即可：

>> require 'open-uri' 
#=> true
>> open("http://ecorner.stanford.edu/RecentlyAdded.xml", 'User-Agent' => 'ruby') 
#=> #<File:/var/folders/H9/H9qnar1yGZqBrWFGuTE0RU+++TI/-Tmp-/open-uri20110505-25566-zsc3pd-0>

Answer 2

这对我有用：

require 'open-uri'
require 'nokogiri'

doc = Nokogiri::XML(open('http://ecorner.stanford.edu/RecentlyAdded.xml'))
puts doc.search('title').map{ |n| n.text }

>> Recently Added STVP Entrepreneurship Corner Materials
>> STVP Entrepreneurship Corner
>> Podcast: Developing Products that Save Lives - Richard Scheller (Genentech)
>> Podcast: How to Build Instant Connections - Ori Brafman (Author)
>> Podcast: A New Vision for Capital Markets - Barry Silbert (SecondMarket)
>> Podcast: Effective Models for Sustainable Growth - Jennifer Morris (Conservation International)

请注意，您遇到了 500 范围的错误。这意味着他们的服务器正在运行，但功能足以承认该问题。如果您收到 400 范围的错误，他们会出于某种原因拒绝您访问内容，所以我怀疑问题出在身份验证或您这边的任何问题上。