title: Example of URL builder in Ktor
body: <p>I'm using Ktor client to make calls to an API and I didn't find any examples of how to construct a URL with query parameters.</p>
  <p>I wanted something like this:</p>
  <pre><code>protocol = HTTPS,
  host = api.server.com,
  path = get/items,
  queryParams = List(
    Pair(&quot;since&quot;, &quot;2020-07-17&quot;),
    
  )
  </code></pre>
  <p>I can't find any examples of how to use URL builder for this.</p>