def app(environ, start_response):
    status = '200 OK'
    output = [b'Hello World!']
    content_length = str(len(b''.join(output)))

    response_headers = [('Content-type', 'text/plain'),
                        ('Content-Length', content_length)]

    start_response(status, response_headers)

    return output
This is very basic WSGI app useful for testing the performance of guv and guv.wsgi without
dataset/ETHPy150Open veegee/guv/examples/wsgi_app.py/app