Changing href attributes with nokogiri and ruby on rails

I Have a HTML document with links links, for exemple:

<html>
  <body>
   <ul>
     <li><a href="http://someurl.com/etc/etc">teste1</a></li>
     <li><a href="http://someurl.com/etc/etc">teste2</a></li>
     <li><a href="http://someurl.com/etc/etc">teste3</a></li>
   <ul>
  </body>
</html>

I want with Ruby on Rails, with nokogiri or some other method, to have a final doc like this:

<html>
  <body>
    <ul>
      <li><a href="http://myproxy.com/?url=http://someurl.com/etc/etc">teste1</a></li>
      <li><a href="http://myproxy.com/?url=http://someurl.com/etc/etc">teste2</a></li>
      <li><a href="http://myproxy.com/?url=http://someurl.com/etc/etc">teste3</a></li>
    <ul>
  </body>
</html>

What's the best strategy to achieve this?

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Changing href attributes with nokogiri and ruby on rails

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