title: PRAW 4: 400 ERROR when trying to download a users comments
body: <p>I'm trying to create a Reddit bot that when a username is mentioned it gets the users comments and sends it to an API to analyze them and return a request but when I try to download them it gives me</p>
  
  <pre><code>prawcore.exceptions.BadRequest: received 400 HTTP response
  </code></pre>
  
  <p>This is the code:</p>
  
  <pre><code>    if text.startswith('/u/PersonalityInsights'):
          print "Mentioned!"
          print comment
          username = text.split()[1]
          print username
          if username.startswith('/u/'):
              validusername = username[3:]
              print validusername
              global redditor
              redditor = bot.redditor(username)
          else:
              global redditor
              redditor = bot.redditor(username)
          file = codecs.open('userscommentsreddit.txt', 'w+', encoding='utf8')
          for comment in redditor.get_comments(limit=None):
              print comment.body
  </code></pre>
  
  <p>The method I'm using is: <code>get_comments(limit=None)</code></p>
  
  <p>in PRAW 3 it worked but here it fails. I tried lowercasing the username but it failed with the same error. The account I'm trying to download the comments is mine: /u/UnknownDeveloper</p>
  
  <p>I tried lowering the username but the same error, Replaced the for loop with this: <code>for comment in redditor.comments.new(limit=None):</code> and still an error 400</p>
  
  <p>If you are interested in the full code here is a link to a <a href="https://gist.github.com/TheRealUnknownDeveloper/124436b18ebe4bf2b842f92bb5282c83" rel="nofollow noreferrer">GitHub gist</a>.</p>
  
  <p>Version of Praw 4.1.0</p>