from flask import Flask

app = Flask(__name__)

@app.route('/')
def main():
    return 'Hello World!', 200

if __name__ == '__main__':
    import os
    HOST = os.environ.get('SERVER_HOST', 'localhost')
    try:
        PORT = int(os.environ.get('SERVER_PORT', '6060'))
    except ValueError:
        PORT = 6060
    app.run(HOST, PORT)