code: def change_tunnel_ad_url(self):
          ''' Change tunnel ad url. '''
          if self.is_open:
              self.close()
          req = requests.delete('https://api.psiturk.org/api/tunnel/',
                                auth=(self.access_key, self.secret_key))
          # the request content here actually will include the tunnel_hostname
          # if needed or wanted.
          if req.status_code in [401, 403, 500]:
              print(req.content)
              return Falsf change_tunnel_ad_url(self):
          ''' Change tunnel ad url. '''
          if self.is_open:
              self.close()
          req = requests.delete('https://api.psiturk.org/api/tunnel/',
                                auth=(self.access_key, self.secret_key))
          # the request content here actually will include the tunnel_hostname
          # if needed or wanted.
          if req.status_code in [401, 403, 500]:
              print(req.content)
              return False
docs: Change tunnel ad url.