import argparse
import urllib.request

REMOTE_SERVER_HOST = 'http://www.fit.ac.jp'

class HTTPClient:

    def __init__(self, host):
        self.host = host

    def fetch(self):
        response = urllib.request.urlopen(self.host)
        # Comment out the above line and uncomment the below for Python 2.7.x.
        #response = urllib2.urlopen(self.host)

        data = response.read()
        text = data.decode('utf-8')
        return text

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='HTTP Client Example')
    parser.add_argument('--host', action="store", dest="host",  default=REMOTE_SERVER_HOST)

    given_args = parser.parse_args() 
    host = given_args.host
    client = HTTPClient(host)
    print (client.fetch())