[LibGDX] Change User Agent in web

When i try to connect to a php web page to my site, CloudFlare, a service that i can’t disable, block my ip and deny me to connect, but this only on pc, not on android or other.
I want to know how i can resolve it, i have to chage the user agent of libgdx or what else?
The page that i get is this :

<!DOCTYPE html><!--[if lt IE 7]> <html class="no-js ie6 oldie" lang="en-US"> <![endif]--><!--[if IE 7]>    <html class="no-js ie7 oldie" lang="en-US"> <![endif]--><!--[if IE 8]>    <html class="no-js ie8 oldie" lang="en-US"> <![endif]--><!--[if gt IE 8]><!--> <html class="no-js" lang="en-US"> <!--<![endif]--><head><title>Access denied | www.houseofgames.altervista.org used CloudFlare to restrict access</title><meta charset="UTF-8" /><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" /><meta name="robots" content="noindex, nofollow" /><meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1" /><link rel="stylesheet" id="cf_styles-css" href="/cdn-cgi/styles/cf.errors.css" type="text/css" media="screen,projection" /><!--[if lt IE 9]><link rel="stylesheet" id='cf_styles-ie-css' href="/cdn-cgi/styles/cf.errors.ie.css" type="text/css" media="screen,projection" /><![endif]--><style type="text/css">body{margin:0;padding:0}</style><!--[if lt IE 9]><script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script><![endif]--><!--[if gte IE 9]><!--><script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/zepto/1.0/zepto.min.js"></script><!--<![endif]--><script type="text/javascript" src="/cdn-cgi/scripts/cf.common.js"></script></head><body>  <div id="cf-wrapper">    <div class="cf-alert cf-alert-error cf-cookie-error" id="cookie-alert" data-translate="enable_cookies">Please enable cookies.</div>    <div id="cf-error-details" class="cf-error-details-wrapper">      <div class="cf-wrapper cf-header cf-error-overview">        <h1>Error 1010</h1>        <h2 class="cf-subheadline">Access denied</h2>      </div><!-- /.header -->      <section></section><!-- spacer -->      <div class="cf-section cf-wrapper">        <div class="cf-columns two">          <div class="cf-column">            <h2>What happened?</h2>            <p>The owner of this website (www.houseofgames.altervista.org) has banned your access based on your browser's signature (d3ff78e3cd40497-ua21).</p>          </div>                  </div>      </div><!-- /.section -->      <div class="cf-error-footer cf-wrapper">  <p>    <span class="cf-footer-item">CloudFlare Ray ID: <strong>d3ff78e3cd40497</strong></span>    <span class="cf-footer-separator">&bull;</span>    <span class="cf-footer-item"><span data-translate="your_ip">Your IP</span>: xx.xx.xxx.xxx</span>    <span class="cf-footer-separator">&bull;</span>    <span class="cf-footer-item"><a data-orig-proto="https" data-orig-ref="cloudflare.com/support" id="support_link" data-translate="help" target="_blank">Help</a></span>    <span class="cf-footer-separator">&bull;</span>    <span class="cf-footer-item"><span data-translate="performance_security_by">Performance &amp; security by</span> <a data-orig-proto="https" data-orig-ref="cloudflare.com" id="cloudflare_link" target="_blank">CloudFlare</a></span>      </p></div><!-- /.error-footer -->    </div><!-- /#cf-error-details -->  </div><!-- /#cf-wrapper -->  <script type="text/javascript">  window._cf_translation = {};    </script></body></html>