Ruby HTTP与REST客户端gem：它们如何处理坏网站/404

我试图使用rest客户端gem访问一些网站，但我发现了一个令我困惑的行为。这与将rest客户端用于坏网站有关，在这种情况下，www.google.com/this\u不存在

我所期望的：代码将运行，响应对象将具有404响应代码

实际发生的情况：出现异常，代码提前终止

当我在Net:：HTTP库中尝试同样的方法时，我确实得到了预期的结果

问题是：rest客户端中是否会出现这种行为？如果是这样的话，当你在坏网站上使用时，你将如何找回一个404响应代码的对象

以下是我的irb代码：

2.2.1 :045 > uri = URI('http://www.google.com')
 => #<URI::HTTP http://www.google.com> 
2.2.1 :046 > response = Net::HTTP.get_response(uri)
 => #<Net::HTTPOK 200 OK readbody=true> 
2.2.1 :047 > response.code
 => "200" 
2.2.1 :048 > uri = URI('http://www.google.com/this_does_not_exist')
 => #<URI::HTTP http://www.google.com/this_does_not_exist> 
2.2.1 :049 > response = Net::HTTP.get_response(uri)
 => #<Net::HTTPNotFound 404 Not Found readbody=true> 
2.2.1 :050 > response.code
 => "404" 
2.2.1 :051 > uri = URI('http://www.google.com')
 => #<URI::HTTP http://www.google.com> 
2.2.1 :052 > response = RestClient.get('http://www.google.com')
 => <RestClient::Response 200 "<!doctype h..."> 
2.2.1 :053 > response.code
 => 200 
2.2.1 :054 > response = RestClient.get('http://www.google.com/this_does_not_exist')
RestClient::NotFound: 404 Not Found
    from /Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/abstract_response.rb:223:in `exception_with_response'
    from /Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/abstract_response.rb:103:in `return!'
    from /Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/request.rb:860:in `process_result'
    from /Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/request.rb:776:in `block in transmit'
    from /Users/piperwarrior/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/net/http.rb:853:in `start'
    from /Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/request.rb:766:in `transmit'
    from /Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/request.rb:215:in `execute'
    from /Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/request.rb:52:in `execute'
    from /Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient.rb:67:in `get'
    from (irb):54
    from /Users/piperwarrior/.rvm/rubies/ruby-2.2.1/bin/irb:11:in `<main>'
2.2.1 :055 > 

2.2.1:045>uri=uri（'http://www.google.com')
=> # 
2.2.1:046>response=Net:：HTTP.get\u响应（uri）
=> # 
2.2.1:047>响应代码
=> "200" 
2.2.1:048>uri=uri（'http://www.google.com/this_does_not_exist')
=> # 
2.2.1:049>response=Net:：HTTP.get\u响应（uri）
=> # 
2.2.1:050>响应代码
=> "404" 
2.2.1:051>uri=uri（'http://www.google.com')
=> # 
2.2.1:052>响应=RestClient.get（'http://www.google.com')
=>  
2.2.1:053>响应代码
=> 200 
2.2.1:054>响应=RestClient.get（'http://www.google.com/this_does_not_exist')
RestClient:：NotFound:404未找到
from/Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/abstract\u response.rb:223:in'exception\u with\u response'
from/Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/abstract_response.rb:103:“返回！”
from/Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/request.rb:860:在“过程\结果”中
from/Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/request.rb:776:在“传输中的块”中
from/Users/piperwarrior/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/net/http.rb:853:in'start'
from/Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/request.rb:766:in“传输”
from/Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/request.rb:215:在“执行”中
from/Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient/request.rb:52:in'execute'
from/Users/piperwarrior/.rvm/gems/ruby-2.2.1/gems/rest-client-2.0.0/lib/restclient.rb:67:in'get'
来自（irb）：54
from/Users/piperwarrior/.rvm/rubies/ruby-2.2.1/bin/irb:11:in`'
2.2.1 :055 > 

来自：

• 对于介于

  200

  和

  207

  之间的结果代码，将返回

  RestClient:：Response

• 对于结果代码

  301

  、

  302

  或

  307

  ，如果请求是

  GET

  或

  HEAD

• 对于结果代码

  303

  ，将遵循重定向并将请求转换为

  GET

• 对于其他情况，将引发持有响应的

  RestClient:：Exception

  ；将针对已知错误代码引发特定的异常类
• 对异常调用

  .response

  ，以获取服务器的响应

是的，这是预期的行为，可以使用

e.response

检索响应对象