title: RoboBrowser form submission
body: <p>I'm trying to automate form submission on a website using robobrowser but after I submit the form I don't get the correct response instead it shows me the same page I was on. Here is my code</p>
  
  <pre><code>from robobrowser import RoboBrowser
  
  browser = RoboBrowser()
  browser.open("https://tin.tin.nsdl.com/pantan/StatusTrack.html")
  form = browser.get_forms()[0]
  form["ST_SEARCH_TYPE"].value = 'P'
  form["ST_ACK_NUM"].value = 'Some Number'      #the ack. no.  
  
  browser.submit_form(form)
  browser.select('b')                           #shows the same page again
  </code></pre>