title: 403 Error when scraping despite setting User-Agent in header
body: <p>I want to scrape a website (for player statistics from a football match) but I get a 403 error. This is my first attempt at 
  scraping.</p>
  
  <p>url = '<a href="https://www.whoscored.com/Matches/1375928/LiveStatistics/England-Premier-League-2019-2020-West-Ham-Manchester-City" rel="nofollow noreferrer">https://www.whoscored.com/Matches/1375928/LiveStatistics/England-Premier-League-2019-2020-West-Ham-Manchester-City</a>'</p>
  
  <pre><code>headers = {'Sec-Fetch-Mode': 'no-cors',
  'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36'} 
  
  result = requests.get(url, headers=headers)
  
  print(result.status_code)
  </code></pre>
  
  <p>Edit: I can open the webpage using my browser (chrome).</p>
  
  <p>Edit2: If I run</p>
  
  <pre><code>print(result.status_code)
  print(result.headers)
  print(result.content)
  </code></pre>
  
  <p>then I get the following</p>
  
  <pre><code>403
  {'Content-Type': 'text/html', 'Cache-Control': 'no-cache', 'Connection': 'close', 'Content-Length': '736', 'X-Iinfo': '9-168604272-0 0NNN RT(1566297863307 56) q(0 -1 -1 -1) r(0 -1) B15(4,200,0) U18', 'X-Iejgwucgyu': '1', 'Set-Cookie': 'visid_incap_774904=wSb3+5UxQeC+slK3rAhjswfPW10AAAAAQUIPAAAAAADmqJS6Gs0uzOV2Z5XomjoU; expires=Wed, 19 Aug 2020 06:56:00 GMT; path=/; Domain=.whoscored.com, incap_ses_198_774904=2GHrGcAd9C8niMLwwnK/AgfPW10AAAAAttp7+XadyowHY5iqiWs/Yg==; path=/; Domain=.whoscored.com'}
  b'&lt;html style="height:100%"&gt;&lt;head&gt;&lt;META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW"&gt;&lt;meta name="format-detection" content="telephone=no"&gt;&lt;meta name="viewport" content="initial-scale=1.0"&gt;&lt;meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"&gt;&lt;/head&gt;&lt;body style="margin:0px;height:100%"&gt;&lt;iframe id="main-iframe" src="/_Incapsula_Resource?CWUDNSAI=21&amp;xinfo=9-168604272-0%200NNN%20RT%281566297863307%2056%29%20q%280%20-1%20-1%20-1%29%20r%280%20-1%29%20B15%284%2c200%2c0%29%20U18&amp;incident_id=198003090216026722-548063901729035097&amp;edet=15&amp;cinfo=04000000" frameborder=0 width="100%" height="100%" marginheight="0px" marginwidth="0px"&gt;Request unsuccessful. Incapsula incident ID: 198003090216026722-548063901729035097&lt;/iframe&gt;&lt;/body&gt;&lt;/html&gt;'
  </code></pre>