title: Scrapy Accept-Language not working
body: <p>I'm using scrapy for crawling a webpage and the problem is that the spider crawls the urls but the data of each url is returned in a random language (en, pt, it, es...).</p>
  
  <p>I'm using the settings:</p>
  
  <pre><code>USER_AGENT = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36"
  
  DEFAULT_REQUEST_HEADERS = {
     'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
     'Accept-Language': 'en',
  }
  </code></pre>
  
  <p>Why isn't it returning the pages in english? (the web page is has english option).</p>