How to use the httpie.status.ExitStatus.SUCCESS function in httpie

def test_CRLF_formatted_response(self, httpbin):
        r = http('--pretty=format', 'GET', httpbin.url + '/get')
        assert r.exit_status == ExitStatus.SUCCESS
        self._validate_crlf(r)

def test_version():
    r = http('--version', tolerate_error_exit_status=True)
    assert r.exit_status == ExitStatus.SUCCESS
    # FIXME: py3 has version in stdout, py2 in stderr
    assert httpie.__version__ == r.strip()

def test_3xx_check_status_redirects_allowed_exits_0(httpbin):
    r = http('--check-status', '--follow',
             'GET', httpbin.url + '/status/301',
             tolerate_error_exit_status=True)
    # The redirect will be followed so 200 is expected.
    assert HTTP_OK in r
    assert r.exit_status == ExitStatus.SUCCESS

if '--download' in args:
                # Let the progress reporter thread finish.
                time.sleep(.5)
        except SystemExit:
            if tolerate_error_exit_status:
                exit_status = ExitStatus.ERROR
            else:
                dump_stderr()
                raise
        except Exception:
            stderr.seek(0)
            sys.stderr.write(stderr.read())
            raise
        else:
            if (not tolerate_error_exit_status
                    and exit_status != ExitStatus.SUCCESS):
                dump_stderr()
                raise ExitStatusError(
                    'httpie.core.main() unexpectedly returned'
                    f' a non-zero exit status: {exit_status}'
                )

        stdout.seek(0)
        stderr.seek(0)
        output = stdout.read()
        try:
            output = output.decode('utf8')
        except UnicodeDecodeError:
            r = BytesCLIResponse(output)
        else:
            r = StrCLIResponse(output)
        r.stderr = stderr.read()

env.program_name = os.path.basename(program_name)
    args = decode_raw_args(args, env.stdin_encoding)
    plugin_manager.load_installed_plugins()

    from httpie.cli.definition import parser

    if env.config.default_options:
        args = env.config.default_options + args

    include_debug_info = '--debug' in args
    include_traceback = include_debug_info or '--traceback' in args

    if include_debug_info:
        print_debug_info(env)
        if args == ['--debug']:
            return ExitStatus.SUCCESS

    exit_status = ExitStatus.SUCCESS

    try:
        parsed_args = parser.parse_args(
            args=args,
            env=env,
        )
    except KeyboardInterrupt:
        env.stderr.write('\n')
        if include_traceback:
            raise
        exit_status = ExitStatus.ERROR_CTRL_C
    except SystemExit as e:
        if e.code != ExitStatus.SUCCESS:
            env.stderr.write('\n')

if include_traceback:
                raise
            exit_status = ExitStatus.ERROR
    else:
        try:
            exit_status = program(
                args=parsed_args,
                env=env,
            )
        except KeyboardInterrupt:
            env.stderr.write('\n')
            if include_traceback:
                raise
            exit_status = ExitStatus.ERROR_CTRL_C
        except SystemExit as e:
            if e.code != ExitStatus.SUCCESS:
                env.stderr.write('\n')
                if include_traceback:
                    raise
                exit_status = ExitStatus.ERROR
        except requests.Timeout:
            exit_status = ExitStatus.ERROR_TIMEOUT
            env.log_error(f'Request timed out ({parsed_args.timeout}s).')
        except requests.TooManyRedirects:
            exit_status = ExitStatus.ERROR_TOO_MANY_REDIRECTS
            env.log_error(
                f'Too many redirects'
                f' (--max-redirects=parsed_args.max_redirects).'
            )
        except Exception as e:
            # TODO: Further distinction between expected and unexpected errors.
            msg = str(e)

initial_request = message
            else:
                final_response = message
                if args.check_status or downloader:
                    exit_status = http_status_to_exit_status(
                        http_status=message.status_code,
                        follow=args.follow
                    )
                    if (not env.stdout_isatty
                            and exit_status != ExitStatus.SUCCESS):
                        env.log_error(
                            f'HTTP {message.raw.status} {message.raw.reason}',
                            level='warning'
                        )

        if downloader and exit_status == ExitStatus.SUCCESS:
            # Last response body download.
            download_stream, download_to = downloader.start(
                initial_url=initial_request.url,
                final_response=final_response,
            )
            write_stream(
                stream=download_stream,
                outfile=download_to,
                flush=False,
            )
            downloader.finish()
            if downloader.interrupted:
                exit_status = ExitStatus.ERROR
                env.log_error(
                    'Incomplete download: size=%d; downloaded=%d' % (
                        downloader.status.total_size,

Translate HTTP status code to exit status code.

    (Relevant only when invoked with --check-status or --download.)

    """
    if 300 <= http_status <= 399 and not follow:
        # Redirect
        return ExitStatus.ERROR_HTTP_3XX
    elif 400 <= http_status <= 499:
        # Client Error
        return ExitStatus.ERROR_HTTP_4XX
    elif 500 <= http_status <= 599:
        # Server Error
        return ExitStatus.ERROR_HTTP_5XX
    else:
        return ExitStatus.SUCCESS

def program(
    args: argparse.Namespace,
    env: Environment,
) -> ExitStatus:
    """
    The main program without error handling.

    """
    exit_status = ExitStatus.SUCCESS
    downloader = None

    try:
        if args.download:
            args.follow = True  # --download implies --follow.
            downloader = Downloader(
                output_file=args.output_file,
                progress_file=env.stderr,
                resume=args.download_resume
            )
            downloader.pre_request(args.headers)

        initial_request = None
        final_response = None

        for message in collect_messages(args, env.config.directory):