title: Custom headers in Phantomjs Selenium WebDriver
body: <p>According to <a href="https://github.com/detro/ghostdriver/pull/229" rel="noreferrer">this</a> it is possible now to modify headers. Atm i need to modify Accept-Language in PhantomJS webdriver. This code doesn't work</p>
  
  <pre><code>DesiredCapabilities.PHANTOMJS['phantomjs.page.customHeaders.Accept-Language'] = 'ru-RU'
  driver = webdriver.PhantomJS()
  </code></pre>
  
  <p>Is it possible somehow to configure Phantomjs to send my header? i don't care where: inside ghostdriver, phantomjs or phantomjs-webdriver. </p>