import sys, os

def application(environ, start_response):
    start_response("200 OK", [("Content-Type", "text/html")])
    python_version = sys.version
    app_dir = os.path.dirname(os.path.abspath(__file__))
    files = os.listdir(app_dir)
    body = f"""
    <h2>Passenger is working!</h2>
    <p><b>Python:</b> {python_version}</p>
    <p><b>App folder:</b> {app_dir}</p>
    <p><b>Files found:</b> {files}</p>
    """
    return [body.encode()]