server.py

import sys
import optparse
import flask

parser = optparse.OptionParser("usage: %prog [options]", add_help_option=False)
parser.add_option("-h", "--host", dest="host", default='', type="string")
parser.add_option("-p", "--port", dest="port", default=5000, type="int")
parser.add_option("-g", "--gateway", dest="gateway", default="", type="string")
parser.add_option("-f", "--file", dest="file", default="", type="string")
parser.add_option("-b", "--binary", dest="binary", action="store_true", default=False)
parser.add_option("-v", "--verbose", dest="verbose", default=0, type="int")
(opt, args) = parser.parse_args() 

payload = None
if opt.file:
    with open(opt.file, "rb" if opt.binary else "rt") as file:
        payload = file.read()

app = flask.Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def hello_world():
    if payload:
        return payload, 200
    else:
        return 'Hello, World!', 200

if __name__ == '__main__':
    if opt.gateway == "" or opt.gateway == "wz":
        import logging
        from werkzeug.serving import WSGIRequestHandler
        WSGIRequestHandler.protocol_version = "HTTP/1.1"
        wzlog = logging.getLogger("werkzeug")
        wzlog.setLevel(logging.WARN)
        app.run(host=opt.host, port=opt.port)

    if opt.gateway == "fw":
        import fastwsgi
        fastwsgi.LOGGING = opt.verbose
        fastwsgi.run(wsgi_app=app, host=opt.host, port=opt.port, loglevel=opt.verbose)

    if opt.gateway == "wr":
        import waitress
        waitress.serve(app=app, host=opt.host, port=opt.port)

    print("==== Server close =====")