Basic database server in Python for RC pairing interview

basic_db_server.py

from http.server import BaseHTTPRequestHandler, HTTPServer

HOST_NAME = 'localhost'
PORT_NUMBER = 4000

my_database = {}

class DatabaseHandler(BaseHTTPRequestHandler):
    def do_HEAD(self):
        self.send_response(200)
        self.send_header('Content-type', 'text/html')
        self.end_headers()


    def do_GET(self):
        if self.path[0:5] == '/set?':
            self.respond(200)
            self.set_values(self.path)            
        elif self.path[0:9] == '/get?key=':
            self.respond(200)
            self.get_value(self.path)
        else:
            print("Other GET request")
            self.respond(500)


    def set_values(self, values):
        entry = values.split('?')[1].split("=")
        try:  
            key = entry[0]
            value = entry[1]
            my_database[key] = value
        except IndexError:
            self.user_message("<p>{} is not a valid key-value pair</p>".format(entry))
        else:     
            self.user_message("<p>Setting data: '{}' = '{}'</p>".format(key, value))
            print(my_database)         


    def get_value(self, keypath):
        key = keypath.split('=')[1]
        print("Getting data: {}".format(key))
        try:
            value = my_database[key]
        except KeyError:
            self.user_message("<p>Key '{}' not present in database</p>".format(key))
        else:
             self.user_message("<p>Value of '{}': <b>{}</b></p>".format(key, value))


    def respond(self, status_code):
        path = self.path
        self.send_response(status_code)
        self.send_header('Content-type', 'text/html')
        self.end_headers()
        self.user_message("You accessed path: {}".format(path))


    def user_message(self, message):
        # use bytes() for content or throws error
        self.wfile.write(bytes(message, 'UTF-8'))


if __name__ == '__main__':
    server_class = HTTPServer
    httpd = server_class((HOST_NAME, PORT_NUMBER), DatabaseHandler)
    print('Starting server - %s:%s' % (HOST_NAME, PORT_NUMBER))
    try:
        httpd.serve_forever()
    except KeyboardInterrupt:
        pass
    httpd.server_close()
    print('Stopping server - %s:%s' % (HOST_NAME, PORT_NUMBER))