Ruby:检查URI是否为HTTPS？

Question

我想检查URI是否需要SSL身份验证:

url = URI.parse("http://www.google.com")

# [some code]

if url.instance_of? URI::HTTPS
   http.use_ssl=true
   http.verify_mode = OpenSSL::SSL::VERIFY_NONE
end

但是,这几行会引发以下错误..

/usr/lib/ruby/1.8/uri/common.rb:436:in `split': bad URI(is not URI?): HTTPS (URI::InvalidURIError)
    from /usr/lib/ruby/1.8/uri/common.rb:485:in `parse'
    from /usr/lib/ruby/1.8/uri/common.rb:608:in `URI'
    from links.rb:18

为什么会这样？

Answer 1

>> uri = URI.parse("http://www.google.com")
=> #<URI::HTTP:0x1014ca458 URL:http://www.google.com>
>> uri.scheme
=> "http"
>> uri = URI.parse("https://mail.google.com")
=> #<URI::HTTPS:0x1014c2e60 URL:https://mail.google.com>
>> uri.scheme
=> "https"

所以你可以用简单的"https"字符串检查uri的方案.

Answer 2

如前面的答案所示,HTTP并且HTTPS是不同的类.特别是,HTTPS是类的子HTTP类.因此你可以检查instance_of?.

http  = URI.parse "http://example.com"
https = URI.parse "https://example.com"

http.instance_of?  URI::HTTPS  #=> false
https.instance_of? URI::HTTPS  #=> true

但是如果这个层次结构发生变化,那么你的代码可能会中断,因此上面的答案可能更具有前瞻性.