開放-URI紅寶石錯誤

Question

我的代碼：

require 'open-uri' 
print "Enter a URL: " 
add = gets 
added = add.sub!(/http:\/\//, "") 
puts "Info from: #{add}" 
open("#{add}") do |f| 
    img = f.read.scan(/<img/) 
    img = img.length 
    puts "\t#{img} images" 
    f.close 
end 
open("#{add}") do |f| 
    links = f.read.scan(/<a/) 
    links = links.length 
    puts "\t#{links} links" 
    f.close 
end 
open("#{add}") do |f| 
    div = f.read.scan(/<div/) 
    div = div.le1ngth 
    puts "\t#{div} div tags" 
    f.close 
end 

（是的，我知道這是不好的代碼，它請不要評論）當我運行它，併爲URL ，我進去，說：

http://stackoverflow.com 

我得到以下錯誤：

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:32:in `initialize': No such file or directory - http (Errno::ENOENT) 
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:32:in `open_uri_original_open' 
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:32:in `open' 

爲什麼會出現這種錯誤來了，我該如何解決？

Answer 1

的String.sub!方法替換代替字符串，所以add.sub!(/http:\/\//, "")另外改變的add值來設定added。

要使用帶有URI的open(name)方法，name的值必須以URI方案開頭，如http://。

如果你想設置added，這樣做就像這樣：

added = add.sub(/http:\/\//, "")