[ruby on rails]查看报错_in `initialize': connecti on refused

本文链接：https://blog.youkuaiyun.com/qq_41037744/article/details/104570643

本文详细解析了在使用Ruby进行网络请求时遇到的Connection refused错误，通过错误堆栈跟踪，定位到具体代码行及出错原因，为开发者提供了解决此类问题的方法。

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定位错误位置和内容

liyun@hp:~/workspace/happy_book_rails$ ruby abc.rb
/home/liyun/.rbenv/versions/2.2.1/lib/ruby/2.2.0/net/http.rb:879:in `initialize': Connection refused - connect(2) for nil port 80 (Errno::ECONNREFUSED)
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/2.2.0/net/http.rb:879:in `open'
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/2.2.0/net/http.rb:879:in `block in connect'
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/2.2.0/timeout.rb:74:in `timeout'
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/2.2.0/net/http.rb:878:in `connect'
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/2.2.0/net/http.rb:863:in `do_start'
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/2.2.0/net/http.rb:852:in `start'
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/2.2.0/net/http.rb:1375:in `request'
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/httparty-0.14.0/lib/httparty/request.rb:118:in `perform'
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/httparty-0.14.0/lib/httparty.rb:560:in `perform_request'
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/httparty-0.14.0/lib/httparty.rb:486:in `get'
    from /home/liyun/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/httparty-0.14.0/lib/httparty.rb:598:in `get'
    from abc.rb:2:in `<main>'

我们如何定位问题呢？要可以看懂这个出错信息（ error stack)
90%的语言(java, ruby, javascript… )，都是从下到上的执行顺序。（python: 从上到下看。。）
这个代码的执行顺序是从下往上：
先找到 abc.rb 的第二行，
在运行 httparty.rb 598 行
httparty.rb 486 行
… 到最后，执行的是 /home/liyun/.rbenv/versions/2.2.1/lib/ruby/2.2.0/net/http.rb 的 879行：出错信息是：
Connection refused - connect(2) for nil port 80 (Errno::ECONNREFUSED)
上面的出错信息，就是我要搜索的内容。