title: can not POST to website and hitting search
body: <p>I am trying to make a post request to that website:  <a href="http://archive.eso.org/wdb/wdb/asm/dimm_paranal/form" rel="nofollow noreferrer">http://archive.eso.org/wdb/wdb/asm/dimm_paranal/form</a></p>
  
  <p>so far I did that:</p>
  
  <pre><code>import requests
  import bs4
  
  url = 'http://archive.eso.org/wdb/wdb/asm/dimm_paranal/form'
  p = {'search': 'Search',
       'start_date' : '2019-09-17..2019-09-18'}
  
  post = requests.post(url,data=p)
  </code></pre>
  
  <p>when I analyse the text from the post I only get the form webpage html code and not the result of the query. How can I simulate the query?</p>
  
  <p>Additional question: How can I check the checkboxes in the form?</p>