How to use the mlrun.httpd.app function in mlrun

@app.route('/api/filestat', methods=['GET'])
@app.catch_err
def get_filestat():
    schema = request.args.get('schema', '')
    path = request.args.get('path', '')

    _, filename = path.split(path)

    path = get_obj_path(schema, path)
    if not path:
        return app.json_error(
            HTTPStatus.NOT_FOUND, path=path,
            err='illegal path prefix or schema')

    try:
        stat = get_object_stat(path)
    except FileNotFoundError as e:

def get_files():
    schema = request.args.get('schema', '')
    path = request.args.get('path', '')
    size = int(request.args.get('size', '0'))
    offset = int(request.args.get('offset', '0'))

    _, filename = path.split(path)

    path = get_obj_path(schema, path)
    if not path:
        return app.json_error(
            HTTPStatus.NOT_FOUND, path=path,
            err='illegal path prefix or schema')

    try:
        body = get_object(path, size, offset)
    except FileNotFoundError as e:
        return app.json_error(HTTPStatus.NOT_FOUND, path=path, err=str(e))
    if body is None:
        return app.json_error(HTTPStatus.NOT_FOUND, path=path)

    ctype, _ = mimetypes.guess_type(path)
    if not ctype:
        ctype = 'application/octet-stream'

    return Response(
        body, mimetype=ctype, headers={"x-suggested-filename": filename})

def update_run(project, uid):
    try:
        data = request.get_json(force=True)
    except ValueError:
        return app.json_error(HTTPStatus.BAD_REQUEST, reason='bad JSON body')

    app.logger.debug(data)
    iter = int(request.args.get('iter', '0'))
    app.db.update_run(data, uid, project, iter=iter)
    app.app.logger.info('update run: {}'.format(data))
    return jsonify(ok=True)

def log_path(project, uid) -> Path:
    return app.logs_dir / project / uid

@app.route('/api/runs', methods=['DELETE'])
@app.catch_err
def del_runs():
    name = request.args.get('name', '')
    project = request.args.get('project', '')
    labels = request.args.getlist('label')
    state = request.args.get('state', '')
    days_ago = int(request.args.get('days_ago', '0'))

    app.db.del_runs(name, project, labels, state, days_ago)
    return jsonify(ok=True)

@app.route('/api/projects', methods=['GET'])
@app.catch_err
def list_projects():
    full = strtobool(request.args.get('full', 'no'))
    fn = db2dict if full else attrgetter('name')
    projects = []
    for p in app.db.list_projects():
        if isinstance(p, str):
            projects.append(p)
        else:
            projects.append(fn(p))

    return jsonify(ok=True, projects=projects)

@app.route('/api//tag/', methods=['DELETE'])
@app.catch_err
def del_tag(project, name):
    count = app.db.del_tag(project, name)
    return jsonify(ok=True, project=project, name=name, count=count)