<human>:  how to check if a url is valid.
<bot>: Here is a Python program to check if a URL is valid

import urllib.request, urllib.parse, urllib.error

def is_valid_url(url):
  """
  Check if a url is valid.

  :param url: The url.
  :return: True if the url is valid, False otherwise.
  """
  if not url.startswith('http://'):
    return False
  if not url.endswith('/'):
    return False
  return True

# Enter the url
url = "http://www.google.com"

# Calling the function
print((is_valid_url(url)))

#Example Output
# False

#Remember to inspect code for bugs.