How to use the acme.challenges.HTTP01 function in acme

def do_http_challenges(client, authzs):
    cleanup_tokens = []
    challs = [get_chall(a, challenges.HTTP01) for a in authzs]

    for chall_body in challs:
        # Determine the token and key auth for the challenge
        token = chall_body.chall.encode("token")
        resp = chall_body.response(client.net.key)
        keyauth = resp.key_authorization

        # Add the HTTP-01 challenge response for this token/key auth to the
        # challtestsrv
        challSrv.add_http01_response(token, keyauth)
        cleanup_tokens.append(token)

        # Then proceed initiating the challenges with the ACME server
        client.answer_challenge(chall_body, chall_body.response(client.net.key))

    def cleanup():

def rand_http_chall(client):
    d = random_domain()
    csr_pem = chisel2.make_csr([d])
    order = client.new_order(csr_pem)
    authzs = order.authorizations
    for a in authzs:
        for c in a.body.challenges:
            if isinstance(c.chall, challenges.HTTP01):
                return d, c.chall
    raise(Exception("No HTTP-01 challenge found for random domain authz"))

def perform2(self, achalls):
        """Perform achallenges without IDisplay interaction."""
        responses = []

        for achall in achalls:
            if isinstance(achall.chall, challenges.HTTP01):
                server = self.servers.run(
                    self.config.http01_port, challenges.HTTP01)
                response, validation = achall.response_and_validation()
                self.http_01_resources.add(
                    acme_standalone.HTTP01RequestHandler.HTTP01Resource(
                        chall=achall.chall, response=response,
                        validation=validation))
            else:  # tls-sni-01
                server = self.servers.run(
                    self.config.tls_sni_01_port, challenges.TLSSNI01)
                response, (cert, _) = achall.response_and_validation(
                    cert_key=self.key)
                self.certs[response.z_domain] = (self.key, cert)
            self.served[server].add(achall)
            responses.append(response)

def _get_validation_path(self, achall):
        return os.sep + os.path.join(challenges.HTTP01.URI_ROOT_PATH, achall.chall.encode("token"))

def new_authorization(self, authz, client, key, domain):
        for combination in authz.combinations:
            if len(combination) == 1:
                challenger = authz.challenges[combination[0]]
                challenge = challenger.chall
                if isinstance(challenge, acme.challenges.HTTP01):
                    # store (and deliver) needed response for challenge
                    content = challenge.validation(key)
                    event = Event()
                    self.responses.setdefault(domain, {})
                    self.responses[domain][challenge.path] = (content, event)

                    # answer challenges / give ACME server go to check challenge
                    resp = challenge.response(key)
                    client.answer_challenge(challenger, resp)

                    # we can wait until this challenge is first requested ...
                    raise exceptions.AuthorizationNotYetRequested(event)
        else:
            return False

def _perform_achall_with_script(self, achall):
        env = dict(CERTBOT_DOMAIN=achall.domain,
                   CERTBOT_VALIDATION=achall.validation(achall.account_key))
        if isinstance(achall.chall, challenges.HTTP01):
            env['CERTBOT_TOKEN'] = achall.chall.encode('token')
        else:
            os.environ.pop('CERTBOT_TOKEN', None)
        os.environ.update(env)
        _, out = self._execute_hook('auth-hook')
        env['CERTBOT_AUTH_OUTPUT'] = out.strip()
        self.env[achall] = env

def perform2(self, achalls):
        """Perform achallenges without IDisplay interaction."""
        responses = []

        for achall in achalls:
            if isinstance(achall.chall, challenges.HTTP01):
                server = self.servers.run(
                    self.config.http01_port, challenges.HTTP01)
                response, validation = achall.response_and_validation()
                self.http_01_resources.add(
                    acme_standalone.HTTP01RequestHandler.HTTP01Resource(
                        chall=achall.chall, response=response,
                        validation=validation))
            else:  # tls-sni-01
                server = self.servers.run(
                    self.config.tls_sni_01_port, challenges.TLSSNI01)
                response, (cert, _) = achall.response_and_validation(
                    cert_key=self.key)
                self.certs[response.z_domain] = (self.key, cert)
            self.served[server].add(achall)
            responses.append(response)

def get_chall_pref(self, domain):  # pragma: no cover
        # pylint: disable=missing-docstring,no-self-use,unused-argument
        return [challenges.HTTP01]

def perform2(self, achalls):
        """Perform achallenges without IDisplay interaction."""
        responses = []

        for achall in achalls:
            if isinstance(achall.chall, challenges.HTTP01):
                server = self.servers.run(
                    self.config.http01_port, challenges.HTTP01)
                response, validation = achall.response_and_validation()
                self.http_01_resources.add(
                    acme_standalone.HTTP01RequestHandler.HTTP01Resource(
                        chall=achall.chall, response=response,
                        validation=validation))
            else:  # tls-sni-01
                server = self.servers.run(
                    self.config.tls_sni_01_port, challenges.TLSSNI01)
                response, (cert, _) = achall.response_and_validation(
                    cert_key=self.key)
                self.certs[response.z_domain] = (self.key, cert)
            self.served[server].add(achall)
            responses.append(response)

        return responses

def _necessary_ports(self):
        necessary_ports = set()
        if challenges.HTTP01 in self.supported_challenges:
            necessary_ports.add(self.config.http01_port)
        if challenges.TLSSNI01 in self.supported_challenges:
            necessary_ports.add(self.config.tls_sni_01_port)
        return necessary_ports