title: About 'Refer-To' header
body: <p>I have a <code>Refer-To</code> header: </p>
  
  <pre><code>Refer-To: &lt;additional.session.xfer@sccas.home1.net?Target-Dialog=ksdjfhwrklf%3Bremote-tag=676723565%3Blocal-tag=45418454&amp;Require=tdialog&amp;From=tel:+1-237-555-1111&amp;To=tel:+1-987-654-3210&amp;Content-Type=application%2Fsdp&amp;body=v%3D0%0D%0Ao%3D-%202987933623%202987933623%20IN%20IP6%205555::ggg:fff:aaa:bbb%0D%0As%3D-%0D%0Ac%3DIN%20IP6%205555::ggg:fff:aaa:bbb%0D%0At%3D0%200%0D%0Aaudio%203456%20RTP%2FAVP%2097%2096%0D%0Ab%3DAS:25.4%0D%0Aa%3Drtpmap:97%20AMR%0D%0Aa%3Dfmtp:97%20mode-set%3D0%2C2%2C5%2C7%3B%20mode-change-period%3D2%0D%0Aa%3Dmaxptime:20%0D%0A&gt;
  </code></pre>
  
  <p>In this header, there are a lot of <code>%3B</code> or <code>%0D</code> and so on.</p>
  
  <p>I want to konw how to convert them to human-readable?</p>