from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer


class ProxyHTTPRequestHandler(BaseHTTPRequestHandler):
    protocol_version = 'HTTP/1.1'
 
    def do_GET(self, body=True):

        # HTTP 200 + minimal HTTP headers in response
        self.send_response(200)
        self.send_header('transfer-encoding', 'chunked')
        self.send_header('Content-Type', 'text/plain')
        self.end_headers()

        # writing 5 chunks of 10 characters
        for i in range(5):
            text = str(i+1) * 10  # concatenate 10 chars
            chunk = '{0:d}\r\n'.format(len(text)) + text + '\r\n'
            self.wfile.write(chunk.encode(encoding='utf-8'))

        # writing close sequence
        close_chunk = '0\r\n\r\n'
        self.wfile.write(close_chunk.encode(encoding='utf-8'))


def main():
    try:
        server_address = ('127.0.0.1', 8099)

        # I use ThreadingHTTPServer but the problem persists also with HTTPServer
        httpd = ThreadingHTTPServer(server_address, ProxyHTTPRequestHandler)
        print('http server is running')
        httpd.serve_forever()
    except KeyboardInterrupt:
        print(" ^C entered, stopping web server...")
        httpd.socket.close()


if __name__ == '__main__':
    main()