[Ruby] How to follow HTTP redirects and retrieve the final URL

 

In Ruby, you can use the Net::HTTP library to follow HTTP redirects and retrieve the final URL. Here’s how:

Method 1: Using Net::HTTP Manually

require 'net/http'
require 'uri'

def get_redirected_url(url)
uri = URI.parse(url)
response = Net::HTTP.get_response(uri)

if response.is_a?(Net::HTTPRedirection)
return response['location'] # The redirected URL
else
return url # No redirection, return original URL
end
end

puts get_redirected_url("http://example.com")

 

This method fetches the response header and checks for redirection.

 

Method 2: Following Redirects Automatically
If you want to follow multiple redirects until you reach the final destination:

 

require 'net/http'
require 'uri'

def get_final_url(url, limit = 10)
raise "Too many redirects" if limit == 0

uri = URI.parse(url)
response = Net::HTTP.get_response(uri)

case response
when Net::HTTPRedirection
new_url = response['location']
get_final_url(new_url, limit - 1) # Follow redirect
else
uri.to_s # Return final URL
end
end

puts get_final_url("http://example.com")

 

This method follows up to 10 redirects.

 

Method 3: Using open-uri (Simpler Approach)

 

require 'open-uri'

def get_redirected_url(url)
URI.open(url) { |resp| resp.base_uri.to_s }
end

puts get_redirected_url("http://example.com")

This approach uses open-uri, which automatically follows redirects and returns the final URL.

 

Would you like a more advanced version with custom headers or cookies?

 

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