blocks|key|1017777|text|我不是一个Ruby用户，但您基本上需要的是解释HTTP头的东西。下面的库似乎可以做到这一点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1017778|http://www.ensta.fr/~diam/ruby/online/ruby-doc-stdlib/libdoc/net/http/rdoc/classes/Net/HTTP.html|offset|length|1017779|跳到“跟随重定向”。|1017780|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2O|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

I'm not much of a Ruby user, but what you basically need is something to interpret HTTP headers. The following library appears to do that:

<a href="http://www.ensta.fr/~diam/ruby/online/ruby-doc-stdlib/libdoc/net/http/rdoc/classes/Net/HTTP.html" rel="nofollow">http://www.ensta.fr/~diam/ruby/online/ruby-doc-stdlib/libdoc/net/http/rdoc/classes/Net/HTTP.html</a>

Skip down to "following redirection."

blocks|key|803053|text|这里有两种同时使用HTTPClient和Open-URI的方法|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|803054|require+'httpclient'
require+'open-uri'

URL+=+'http://www.example.org'

httpc+=+HTTPClient.new
resp+=+httpc.get(URL)
puts+resp.header['Location']
>>+http://www.iana.org/domains/example/

open(URL)+do+%7Cresp%7C
++puts+resp.base_uri.to_s
end
>>+http://www.iana.org/domains/example/|code-block|syntax|javascript|803055|entityMap|0|LINK|mutability|MUTABLE|url|http://dev.ctor.org/http-access2|1|http://www.ruby-doc.org/stdlib/libdoc/open-uri/rdoc/^0|9|A|0|K|8|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

Here's two ways, using both <a href="http://dev.ctor.org/http-access2" rel="noreferrer">HTTPClient</a> and <a href="http://www.ruby-doc.org/stdlib/libdoc/open-uri/rdoc/" rel="noreferrer">Open-URI</a>:

<pre><code>require 'httpclient'
require 'open-uri'

URL = 'http://www.example.org'

httpc = HTTPClient.new
resp = httpc.get(URL)
puts resp.header['Location']
&gt;&gt; http://www.iana.org/domains/example/

open(URL) do |resp|
 puts resp.base_uri.to_s
end
&gt;&gt; http://www.iana.org/domains/example/
</code></pre>

blocks|key|1017862|text|另一种方式，使用Curb|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1017863|def+get_redirected_url(your_url)
++result+=+Curl::Easy.perform(your_url)+do+%7Ccurl%7C
++++curl.follow_location+=+true
++end
++result.last_effective_url
end+|code-block|syntax|javascript|1017864|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/taf2/curb^0|8|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Another way, using <a href="https://github.com/taf2/curb" rel="nofollow">Curb</a>:

<pre><code>def get_redirected_url(your_url)
 result = Curl::Easy.perform(your_url) do |curl|
 curl.follow_location = true
 end
 result.last_effective_url
end 
</code></pre>

blocks|key|803113|text|我实现了一个RequestResolver来满足我的需求：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|803114|https://gist.github.com/lulalala/6be104641bcb60f9d0e8|offset|length|803115|它使用Net::HTTP，并遵循多个重定向。它还处理相对重定向。这是为了我的简单需要，所以可能有bug。如果你发现了一个请告诉我。|803116|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1H|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

I have implemented a RequestResolver for my need:

<a href="https://gist.github.com/lulalala/6be104641bcb60f9d0e8" rel="nofollow">https://gist.github.com/lulalala/6be104641bcb60f9d0e8</a>

It uses Net::HTTP, and follows multiple redirects. It also handles relative redirects.
It was for my simple need so may have bugs. If you discover one please tell me.

blocks|key|803161|text|对于JRuby来说，这是可行的|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|803162|def+get_final_url+(url)
++++final_url+=+""
++++until+url.nil?+do
++++++final_url+=+url
++++++url+=+Net::HTTP.get_response(URI.parse(url))['location']
++++end

++++final_url
++end|code-block|syntax|javascript|803163|entityMap^0|2|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

for <code>JRuby</code> this worked 

<pre><code>def get_final_url (url)
 final_url = ""
 until url.nil? do
 final_url = url
 url = Net::HTTP.get_response(URI.parse(url))['location']
 end

 final_url
 end
</code></pre>

If <code>http://foo.com</code> redirects to <code>1.2.3.4</code> which then redirects to <code>http://finalurl.com</code>, how can I use Ruby to find out the landing URL "http://finalurl.com"?

How can I get the final URL after redirects using Ruby?

如果Ruby重定向到1.2.3.4，然后重定向到http://finalurl.com，我如何使用http://foo.com找到登录URL "

问如何在使用Ruby重定向后获得最终的URL？
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