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          <p>A client-side XHR request for getting data from a URL,
formally known as XMLHttpRequest.</p>
<p>HttpRequest can be used to obtain data from HTTP and FTP protocols,
and is useful for AJAX-style page updates.</p>
<p>The simplest way to get the contents of a text file, such as a
JSON-formatted file, is with <a href="polymer_app_layout/HttpRequest/getString.html">getString</a>.
For example, the foll